Expose chat-latest and default Quick Question to it

docs/api/rest.md

@@ -31,7 +31,7 @@ Chat upload limits:
 ```json
 {
   "providers": {
-    "openai": { "models": ["gpt-4.1-mini"], "loadedAt": "2026-02-14T00:00:00.000Z", "error": null },
+    "openai": { "models": ["chat-latest", "gpt-4.1-mini"], "loadedAt": "2026-02-14T00:00:00.000Z", "error": null },
     "anthropic": { "models": ["claude-3-5-sonnet-latest"], "loadedAt": null, "error": null },
     "xai": { "models": ["grok-3-mini"], "loadedAt": null, "error": null },
     "gemini": { "models": ["gemini-3.5-flash"], "loadedAt": null, "error": null },
@@ -39,7 +39,7 @@ Chat upload limits:
   }
 }
 ```
-- OpenAI model lists are filtered to models that are expected to work with the backend's Responses API implementation.
+- OpenAI model lists are filtered to models that are expected to work with the backend's Responses API implementation, including the exact `chat-latest` alias when returned by OpenAI. Audio, image-generation, embedding, moderation, and other specialized model ids remain excluded. See [OpenAI's Chat Latest documentation](https://developers.openai.com/api/docs/models/chat-latest) for supported capabilities.
 - Gemini model lists are loaded from Google's native Models API and filtered to Gemini `generateContent` model ids.
 - `hermes-agent` is included only when `HERMES_AGENT_API_KEY` is configured. Set it to Hermes `API_SERVER_KEY`, or any non-empty value if that local server does not require auth. `HERMES_AGENT_API_BASE_URL` defaults to `http://127.0.0.1:8642/v1`; set `HERMES_AGENT_MODEL` only when you need an additional fallback/override model id.
 - The backend loads provider model lists at startup and refreshes them about once every 24 hours. If a later provider refresh fails, the response keeps the last loaded model list for that provider and sets `error` to the latest failure message.

docs/api/streaming-chat.md

@@ -109,6 +109,7 @@ Request body:
 ```
 
 Behavior notes:
+- `provider` and `model` are required. Web and native clients default Quick Question to `provider: "openai"` and `model: "chat-latest"` when no Quick Question selection has been saved. Saved Quick Question choices take precedence over this default and are separate from regular chat preferences.
 - `question` is required, trimmed by the server, and must not be empty.
 - The server prepends a Quick Question system prompt that asks for a succinct, direct, self-contained answer without follow-up questions. Clients do not send or maintain this prompt.
 - Quick Questions are always non-persistent. The endpoint does not create a chat or store messages, tool-call logs, assistant output, or `LlmCall` metadata.

ios/Packages/Sybil/Sources/Sybil/SybilAPIClient.swift

@@ -74,6 +74,16 @@ actor SybilAPIClient: SybilAPIClienting {
         return response.chat
     }
 
+    func forkChat(chatID: String, messageID: String? = nil) async throws -> ChatSummary {
+        let response = try await request(
+            "/v1/chats/\(chatID)/fork",
+            method: "POST",
+            body: AnyEncodable(ChatForkBody(messageId: messageID)),
+            responseType: ChatCreateResponse.self
+        )
+        return response.chat
+    }
+
     func updateChatTitle(chatID: String, title: String) async throws -> ChatSummary {
         let response = try await request(
             "/v1/chats/\(chatID)",
@@ -704,6 +714,10 @@ private struct ChatTitleUpdateBody: Encodable {
     var title: String
 }
 
+private struct ChatForkBody: Encodable {
+    var messageId: String?
+}
+
 private struct StarUpdateBody: Encodable {
     var starred: Bool
 }

ios/Packages/Sybil/Sources/Sybil/SybilAPIClienting.swift

@@ -11,6 +11,7 @@ protocol SybilAPIClienting: Sendable {
         messages: [CompletionRequestMessage]?
     ) async throws -> ChatSummary
     func getChat(chatID: String) async throws -> ChatDetail
+    func forkChat(chatID: String, messageID: String?) async throws -> ChatSummary
     func updateChatTitle(chatID: String, title: String) async throws -> ChatSummary
     func updateChatStar(chatID: String, starred: Bool) async throws -> ChatSummary
     func deleteChat(chatID: String) async throws

ios/Packages/Sybil/Sources/Sybil/SybilChatTranscriptView.swift

@@ -1,5 +1,6 @@
 import MarkdownUI
 import SwiftUI
+import UIKit
 
 struct SybilChatTranscriptView: View {
     var messages: [Message]
@@ -9,6 +10,8 @@ struct SybilChatTranscriptView: View {
     var topContentInset: CGFloat = 0
     var bottomContentInset: CGFloat = 0
     var bottomPinRequestID: Int = 0
+    var isForking: Bool = false
+    var onForkResponse: ((String) -> Void)? = nil
 
     @State private var hasTrackedToolCallMessages = false
     @State private var knownToolCallMessageIDs: Set<String> = []
@@ -45,7 +48,11 @@ struct SybilChatTranscriptView: View {
                             MessageBubble(
                                 message: message,
                                 isSending: isSending,
-                                streamingAssistantPresentation: streamingAssistantPresentation
+                                streamingAssistantPresentation: streamingAssistantPresentation,
+                                isForking: isForking,
+                                onFork: {
+                                    onForkResponse?(message.id)
+                                }
                             )
                                 .frame(maxWidth: .infinity)
                         case let .toolGroup(id, messages):
@@ -146,6 +153,8 @@ private struct MessageBubble: View {
     var message: Message
     var isSending: Bool
     var streamingAssistantPresentation: StreamingAssistantPresentation?
+    var isForking: Bool
+    var onFork: (() -> Void)?
 
     private var toolCallMetadata: ToolCallMetadata? {
         message.toolCallMetadata
@@ -164,7 +173,37 @@ private struct MessageBubble: View {
         return streamingAssistantPresentation
     }
 
+    private var canFork: Bool {
+        message.role == .assistant &&
+            !message.id.hasPrefix("temp-") &&
+            onFork != nil
+    }
+
     var body: some View {
+        Group {
+            if canFork {
+                bubbleContent
+                    .contextMenu {
+                        Button {
+                            UIPasteboard.general.string = message.content
+                        } label: {
+                            Label("Copy", systemImage: "doc.on.doc")
+                        }
+
+                        Button {
+                            onFork?()
+                        } label: {
+                            Label("Fork", systemImage: "arrow.triangle.branch")
+                        }
+                        .disabled(isForking)
+                    }
+            } else {
+                bubbleContent
+            }
+        }
+    }
+
+    private var bubbleContent: some View {
         HStack(alignment: .top, spacing: 0) {
             leadingSpacer
 

ios/Packages/Sybil/Sources/Sybil/SybilPhoneShellView.swift

@@ -130,7 +130,10 @@ struct SybilPhoneShellView: View {
             route: route,
             onRequestBack: { _ in showSidebarOverlay() },
             onRequestNewChat: sidebarWorkspaceNewChatAction,
-            onShowSidebar: showSidebarOverlay
+            onShowSidebar: showSidebarOverlay,
+            onOpenForkedChat: { chatID in
+                showRoute(.chat(chatID))
+            }
         )
         .background(SybilTheme.background)
         .blur(radius: SidebarOverlaySwipeMetrics.workspaceBlurRadius(for: sidebarOverlayProgress))
@@ -511,6 +514,9 @@ private struct SybilPhoneSidebarRoot: View {
                 },
                 onSelect: { item in
                     onSelect(item.selection)
+                },
+                onOpenForkedChat: { chatID in
+                    onSelect(.chat(chatID))
                 }
             )
         }
@@ -585,6 +591,7 @@ private struct SybilPhoneDestinationView: View {
     let onRequestBack: (_ animateNavigation: Bool) -> Void
     let onRequestNewChat: (() -> Void)?
     let onShowSidebar: () -> Void
+    let onOpenForkedChat: (String) -> Void
 
     var body: some View {
         SybilWorkspaceView(
@@ -593,7 +600,8 @@ private struct SybilPhoneDestinationView: View {
             navigationLeadingControl: .showSidebar,
             onShowSidebar: onShowSidebar,
             onRequestBack: onRequestBack,
-            onRequestNewChat: onRequestNewChat
+            onRequestNewChat: onRequestNewChat,
+            onOpenForkedChat: onOpenForkedChat
         )
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topLeading)
         .task(id: route) {

ios/Packages/Sybil/Sources/Sybil/SybilQuickQuestionView.swift

@@ -102,13 +102,12 @@ struct SybilQuickQuestionView: View {
                         set: { viewModel.updateQuickQuestionPrompt($0) }
                     ),
                     selection: $promptSelection,
-                    axis: .vertical
+                    axis: .horizontal
                 )
                 .focused($promptFocused)
                 .font(.body)
                 .textInputAutocapitalization(.sentences)
                 .autocorrectionDisabled(false)
-                .lineLimit(1 ... 6)
                 .submitLabel(.send)
                 .onSubmit(submitQuestion)
                 .padding(.horizontal, 12)

ios/Packages/Sybil/Sources/Sybil/SybilSettingsStore.swift

@@ -52,9 +52,9 @@ final class SybilSettingsStore {
         self.preferredModelByProvider = preferredModels
 
         self.quickQuestionPreferredProvider =
-            defaults.string(forKey: Keys.quickQuestionPreferredProvider).flatMap(Provider.init(rawValue:)) ?? provider
+            defaults.string(forKey: Keys.quickQuestionPreferredProvider).flatMap(Provider.init(rawValue:)) ?? .openai
         self.quickQuestionPreferredModelByProvider = [
-            .openai: defaults.string(forKey: Keys.quickQuestionPreferredOpenAIModel) ?? preferredModels[.openai] ?? "gpt-4.1-mini",
+            .openai: defaults.string(forKey: Keys.quickQuestionPreferredOpenAIModel) ?? "chat-latest",
             .anthropic: defaults.string(forKey: Keys.quickQuestionPreferredAnthropicModel) ?? preferredModels[.anthropic] ?? "claude-3-5-sonnet-latest",
             .xai: defaults.string(forKey: Keys.quickQuestionPreferredXAIModel) ?? preferredModels[.xai] ?? "grok-3-mini",
             .gemini: defaults.string(forKey: Keys.quickQuestionPreferredGeminiModel) ?? preferredModels[.gemini] ?? "gemini-3.5-flash",

ios/Packages/Sybil/Sources/Sybil/SybilSidebarView.swift

@@ -1,5 +1,6 @@
 import Observation
 import SwiftUI
+import UIKit
 
 struct SybilSidebarView: View {
     @Bindable var viewModel: SybilViewModel
@@ -111,6 +112,7 @@ struct SybilSidebarItemList: View {
     @Bindable var viewModel: SybilViewModel
     var isSelected: (SidebarItem) -> Bool
     var onSelect: (SidebarItem) -> Void
+    var onOpenForkedChat: ((String) -> Void)? = nil
     @State private var renameTarget: SidebarItem?
     @State private var renameTitle = ""
 
@@ -168,13 +170,26 @@ struct SybilSidebarItemList: View {
                                     Label(item.starred ? "Unstar" : "Star", systemImage: item.starred ? "star.slash" : "star")
                                 }
 
-                                if item.kind == .chat {
+                                if case let .chat(chatID) = item.selection {
+                                    Button {
+                                        forkChat(item)
+                                    } label: {
+                                        Label("Fork", systemImage: "arrow.triangle.branch")
+                                    }
+                                    .disabled(viewModel.isForkingChat || item.isRunning)
+
                                     Button {
                                         renameTarget = item
                                         renameTitle = item.title
                                     } label: {
                                         Label("Rename", systemImage: "pencil")
                                     }
+
+                                    Button {
+                                        UIPasteboard.general.string = chatID
+                                    } label: {
+                                        Label("Copy Session ID", systemImage: "doc.on.doc")
+                                    }
                                 }
 
                                 Button(role: .destructive) {
@@ -215,6 +230,28 @@ struct SybilSidebarItemList: View {
             .disabled(renameTitle.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
         }
     }
+
+    private func forkChat(_ item: SidebarItem) {
+        guard case let .chat(chatID) = item.selection else {
+            return
+        }
+
+        let selectionAtStart = viewModel.selectedItem
+        let draftKindAtStart = viewModel.draftKind
+        Task {
+            guard let forkedChat = await viewModel.forkChat(chatID: chatID),
+                  viewModel.selectedItem == selectionAtStart,
+                  viewModel.draftKind == draftKindAtStart else {
+                return
+            }
+
+            if let onOpenForkedChat {
+                onOpenForkedChat(forkedChat.id)
+            } else {
+                viewModel.select(.chat(forkedChat.id))
+            }
+        }
+    }
 }
 
 struct SybilSidebarRow: View {

ios/Packages/Sybil/Sources/Sybil/SybilViewModel.swift

@@ -170,6 +170,7 @@ final class SybilViewModel {
     var isLoadingCollections = false
     var isLoadingSelection = false
     var isCreatingSearchChat = false
+    var isForkingChat = false
     var chatBottomPinRequestID = 0
     var errorMessage: String?
 
@@ -221,7 +222,7 @@ final class SybilViewModel {
     private let clientFactory: (APIConfiguration) -> any SybilAPIClienting
 
     private let fallbackModels: [Provider: [String]] = [
-        .openai: ["gpt-4.1-mini"],
+        .openai: ["gpt-4.1-mini", "chat-latest"],
         .anthropic: ["claude-3-5-sonnet-latest"],
         .xai: ["grok-3-mini"],
         .gemini: ["gemini-3.5-flash", "gemini-flash-latest"],
@@ -958,6 +959,36 @@ final class SybilViewModel {
         }
     }
 
+    @discardableResult
+    func forkChat(chatID: String, messageID: String? = nil) async -> ChatSummary? {
+        guard isAuthenticated, !isForkingChat else {
+            return nil
+        }
+
+        guard messageID != nil || !isChatRowRunning(chatID) else {
+            errorMessage = "Wait for the response to finish before forking this chat."
+            return nil
+        }
+
+        let forkDescription = messageID.map { "chat \(chatID) from response \($0)" } ?? "chat \(chatID)"
+        SybilLog.info(SybilLog.ui, "Forking \(forkDescription)")
+        errorMessage = nil
+        isForkingChat = true
+        defer {
+            isForkingChat = false
+        }
+
+        do {
+            let forkedChat = try await client().forkChat(chatID: chatID, messageID: messageID)
+            applyChatSummary(forkedChat, moveToFront: true)
+            return forkedChat
+        } catch {
+            errorMessage = normalizeAPIError(error)
+            SybilLog.error(SybilLog.ui, "Fork failed", error: error)
+            return nil
+        }
+    }
+
     func renameChat(chatID: String, title: String) async {
         guard isAuthenticated else {
             return

ios/Packages/Sybil/Sources/Sybil/SybilWorkspaceView.swift

@@ -19,6 +19,7 @@ struct SybilWorkspaceView: View {
     var onShowSidebar: (() -> Void)? = nil
     var onRequestBack: ((_ animateNavigation: Bool) -> Void)? = nil
     var onRequestNewChat: (() -> Void)? = nil
+    var onOpenForkedChat: ((String) -> Void)? = nil
     @FocusState private var composerFocused: Bool
     @Environment(\.dismiss) private var dismiss
     @State private var isShowingAttachmentOptions = false
@@ -196,7 +197,9 @@ struct SybilWorkspaceView: View {
                         streamingAssistantPresentation: viewModel.displayedStreamingAssistantPresentation,
                         topContentInset: showsCustomWorkspaceNavigation ? customWorkspaceNavigationContentInset : 0,
                         bottomContentInset: viewModel.showsComposer ? composerOverlayContentInset : 0,
-                        bottomPinRequestID: viewModel.chatBottomPinRequestID
+                        bottomPinRequestID: viewModel.chatBottomPinRequestID,
+                        isForking: viewModel.isForkingChat,
+                        onForkResponse: forkResponse
                     )
                     .id(transcriptScrollContextID)
                 }
@@ -230,6 +233,28 @@ struct SybilWorkspaceView: View {
         }
     }
 
+    private func forkResponse(messageID: String) {
+        guard viewModel.draftKind == nil,
+              case let .chat(chatID) = viewModel.selectedItem else {
+            return
+        }
+
+        let selectionAtStart = viewModel.selectedItem
+        Task {
+            guard let forkedChat = await viewModel.forkChat(chatID: chatID, messageID: messageID),
+                  viewModel.selectedItem == selectionAtStart,
+                  viewModel.draftKind == nil else {
+                return
+            }
+
+            if let onOpenForkedChat {
+                onOpenForkedChat(forkedChat.id)
+            } else {
+                viewModel.select(.chat(forkedChat.id))
+            }
+        }
+    }
+
     private var customWorkspaceNavigationBar: some View {
         HStack(spacing: 14) {
             workspaceNavigationLeadingControl

ios/Packages/Sybil/Tests/SybilTests/SybilTests.swift

@@ -13,6 +13,9 @@ private struct MockClientCallSnapshot: Sendable {
     var listSearches = 0
     var createChat = 0
     var getChat = 0
+    var forkChat = 0
+    var lastForkChatID: String?
+    var lastForkMessageID: String?
     var updateChatTitle = 0
     var suggestChatTitle = 0
     var updateChatStar = 0
@@ -43,11 +46,13 @@ private actor MockSybilClient: SybilAPIClienting {
     private let chatDetails: [String: ChatDetail]
     private let searchDetails: [String: SearchDetail]
     private let createChatResponse: ChatSummary?
+    private let forkChatResponse: ChatSummary?
     private let updateChatTitleResponses: [String: ChatSummary]
     private let suggestChatTitleResponses: [String: ChatSummary]
     private let updateChatStarResponses: [String: ChatSummary]
     private let updateSearchStarResponses: [String: SearchSummary]
     private let activeRunsResponse: ActiveRunsResponse
+    private let modelCatalogResponse: ModelCatalogResponse
 
     private var snapshot = MockClientCallSnapshot()
     private var lastCreateChatCall: ChatCreateCallSnapshot?
@@ -74,12 +79,14 @@ private actor MockSybilClient: SybilAPIClienting {
         chatDetails: [String: ChatDetail] = [:],
         searchDetails: [String: SearchDetail] = [:],
         createChatResponse: ChatSummary? = nil,
+        forkChatResponse: ChatSummary? = nil,
         updateChatTitleResponses: [String: ChatSummary] = [:],
         suggestChatTitleResponses: [String: ChatSummary] = [:],
         updateChatStarResponses: [String: ChatSummary] = [:],
         updateSearchStarResponses: [String: SearchSummary] = [:],
         activeRunsResponse: ActiveRunsResponse = ActiveRunsResponse(),
-        workspaceItemsResponse: [WorkspaceItem]? = nil
+        workspaceItemsResponse: [WorkspaceItem]? = nil,
+        modelCatalogResponse: ModelCatalogResponse = ModelCatalogResponse(providers: [:])
     ) {
         self.chatsResponse = chatsResponse
         self.searchesResponse = searchesResponse
@@ -87,11 +94,13 @@ private actor MockSybilClient: SybilAPIClienting {
         self.chatDetails = chatDetails
         self.searchDetails = searchDetails
         self.createChatResponse = createChatResponse
+        self.forkChatResponse = forkChatResponse
         self.updateChatTitleResponses = updateChatTitleResponses
         self.suggestChatTitleResponses = suggestChatTitleResponses
         self.updateChatStarResponses = updateChatStarResponses
         self.updateSearchStarResponses = updateSearchStarResponses
         self.activeRunsResponse = activeRunsResponse
+        self.modelCatalogResponse = modelCatalogResponse
     }
 
     private static func makeWorkspaceItems(chats: [ChatSummary], searches: [SearchSummary]) -> [WorkspaceItem] {
@@ -220,6 +229,16 @@ private actor MockSybilClient: SybilAPIClienting {
         return detail
     }
 
+    func forkChat(chatID: String, messageID: String?) async throws -> ChatSummary {
+        snapshot.forkChat += 1
+        snapshot.lastForkChatID = chatID
+        snapshot.lastForkMessageID = messageID
+        guard let forkChatResponse else {
+            throw UnexpectedClientCall()
+        }
+        return forkChatResponse
+    }
+
     func updateChatTitle(chatID: String, title: String) async throws -> ChatSummary {
         snapshot.updateChatTitle += 1
         guard let summary = updateChatTitleResponses[chatID] else {
@@ -290,7 +309,7 @@ private actor MockSybilClient: SybilAPIClienting {
     }
 
     func listModels() async throws -> ModelCatalogResponse {
-        ModelCatalogResponse(providers: [:])
+        modelCatalogResponse
     }
 
     func getActiveRuns() async throws -> ActiveRunsResponse {
@@ -775,6 +794,63 @@ private func makeCompletionToolCall(
     #expect(viewModel.errorMessage == nil)
 }
 
+@MainActor
+@Test func wholeChatForkAddsReturnedChatToWorkspace() async throws {
+    let date = Date(timeIntervalSince1970: 1_700_000_160)
+    let source = makeChatSummary(id: "chat-source", date: date)
+    var forked = makeChatSummary(id: "chat-fork", date: date.addingTimeInterval(10))
+    forked.title = "Fork of Chat chat-source"
+    forked.parentChatId = source.id
+    forked.titleGenerationPending = true
+    let client = MockSybilClient(forkChatResponse: forked)
+    let viewModel = SybilViewModel(settings: testSettings(named: #function)) { _ in client }
+    viewModel.isAuthenticated = true
+    viewModel.isCheckingSession = false
+    viewModel.chats = [source]
+    viewModel.workspaceItems = [WorkspaceItem(chat: source)]
+    viewModel.selectedItem = .chat(source.id)
+
+    let result = await viewModel.forkChat(chatID: source.id)
+
+    let snapshot = await client.currentSnapshot()
+    #expect(snapshot.forkChat == 1)
+    #expect(snapshot.lastForkChatID == source.id)
+    #expect(snapshot.lastForkMessageID == nil)
+    #expect(result == forked)
+    #expect(viewModel.chats.first == forked)
+    #expect(viewModel.workspaceItems.first == WorkspaceItem(chat: forked))
+    #expect(viewModel.selectedItem == .chat(source.id))
+    #expect(!viewModel.isForkingChat)
+    #expect(viewModel.errorMessage == nil)
+}
+
+@MainActor
+@Test func responseForkPassesAssistantMessageID() async throws {
+    let date = Date(timeIntervalSince1970: 1_700_000_165)
+    let source = makeChatSummary(id: "chat-source", date: date)
+    var forked = makeChatSummary(id: "response-fork", date: date.addingTimeInterval(10))
+    forked.title = "Fork of 'A useful response'"
+    forked.parentChatId = source.id
+    forked.titleGenerationPending = true
+    let client = MockSybilClient(forkChatResponse: forked)
+    let viewModel = SybilViewModel(settings: testSettings(named: #function)) { _ in client }
+    viewModel.isAuthenticated = true
+    viewModel.isCheckingSession = false
+    viewModel.chats = [source]
+    viewModel.workspaceItems = [WorkspaceItem(chat: source)]
+
+    let result = await viewModel.forkChat(chatID: source.id, messageID: "assistant-message")
+
+    let snapshot = await client.currentSnapshot()
+    #expect(snapshot.forkChat == 1)
+    #expect(snapshot.lastForkChatID == source.id)
+    #expect(snapshot.lastForkMessageID == "assistant-message")
+    #expect(result == forked)
+    #expect(viewModel.sidebarItems.contains(where: { $0.selection == .chat(forked.id) }))
+    #expect(!viewModel.isForkingChat)
+    #expect(viewModel.errorMessage == nil)
+}
+
 @MainActor
 @Test func starringItemsUpdatesSidebarState() async throws {
     let date = Date(timeIntervalSince1970: 1_700_000_175)
@@ -1184,6 +1260,7 @@ private func makeCompletionToolCall(
     #expect(snapshot.runQuickQuestionStream == 1)
     #expect(snapshot.runCompletionStream == 0)
     #expect(body?.provider == .openai)
+    #expect(body?.model == "chat-latest")
     #expect(body?.question == "How do I reset my password?")
     #expect(viewModel.quickQuestionAnswerText == "Reset it from Settings.")
     #expect(!viewModel.isQuickQuestionSending)
@@ -1297,6 +1374,42 @@ private func makeCompletionToolCall(
     #expect(viewModel.quickQuestionPrompt.isEmpty)
 }
 
+@MainActor
+@Test func quickQuestionDefaultsToChatLatestIndependentlyOfRegularChatPreferences() async {
+    let defaults = UserDefaults(suiteName: #function)!
+    defaults.removePersistentDomain(forName: #function)
+    defer { defaults.removePersistentDomain(forName: #function) }
+    defaults.set("anthropic", forKey: "sybil.ios.preferredProvider")
+    defaults.set("gpt-4o", forKey: "sybil.ios.preferredOpenAIModel")
+    let settings = SybilSettingsStore(defaults: defaults)
+    let client = MockSybilClient(modelCatalogResponse: ModelCatalogResponse(providers: [
+        .openai: ProviderModelInfo(models: ["gpt-4.1-mini", "chat-latest"], loadedAt: nil, error: nil),
+        .anthropic: ProviderModelInfo(models: ["claude-3-5-sonnet-latest"], loadedAt: nil, error: nil)
+    ]))
+    let viewModel = SybilViewModel(settings: settings) { _ in client }
+
+    #expect(viewModel.provider == .anthropic)
+    #expect(settings.preferredModelByProvider[.openai] == "gpt-4o")
+    #expect(viewModel.quickQuestionProvider == .openai)
+    #expect(viewModel.quickQuestionModel == "chat-latest")
+    #expect(viewModel.quickQuestionProviderModelOptions.contains("chat-latest"))
+
+    viewModel.setQuickQuestionProvider(.anthropic)
+    viewModel.setQuickQuestionProvider(.openai)
+    #expect(viewModel.quickQuestionModel == "chat-latest")
+
+    await viewModel.bootstrap()
+    #expect(viewModel.quickQuestionModel == "chat-latest")
+    #expect(viewModel.quickQuestionProviderModelOptions == ["gpt-4.1-mini", "chat-latest"])
+
+    viewModel.setQuickQuestionProvider(.anthropic)
+    viewModel.setQuickQuestionProvider(.openai)
+    #expect(viewModel.quickQuestionModel == "chat-latest")
+    #expect(SybilSettingsStore(defaults: defaults).quickQuestionPreferredModelByProvider[.openai] == "chat-latest")
+    #expect(settings.preferredProvider == .anthropic)
+    #expect(settings.preferredModelByProvider[.openai] == "gpt-4o")
+}
+
 @MainActor
 @Test func quickQuestionProviderAndModelSelectionPersistSeparately() async throws {
     let defaults = UserDefaults(suiteName: #function)!

ios/README.md

@@ -16,8 +16,13 @@ second **Option+Space**, the close button, or clicking outside dismisses it.
 Hiding the panel preserves the draft and answer and lets an in-flight answer finish.
 **Open in Chat** saves the question and answer in the regular workspace.
 
+Quick Question defaults to OpenAI `chat-latest` on iPhone, iPad, and Mac. Its saved
+provider/model selection takes precedence and is separate from regular chat preferences.
+
 The regular Mac chat/search composer uses the same Return/Shift+Return rules.
-Holding Return does not repeatedly submit. The iOS software keyboard is unchanged.
+Holding Return does not repeatedly submit. On iOS, Return submits from Quick
+Question, while the normal chat/search composer continues to use Return for a
+new line.
 
 Closing the last Mac window leaves Sybil running, so Option+Space still works.
 Use **Sybil → Quit Sybil** or **Command+Q** to quit the application. The Catalyst
@@ -66,7 +71,9 @@ action, and does not build or embed the macOS helper.
   answer remain available. Reopen the workspace from the panel, then explicitly
   quit with Command+Q. Rebuild and relaunch after changing lifecycle plist keys.
 - In both Mac and iOS Quick Question, reopen an existing prompt and type to replace
-  it. In the Mac workspace, verify Return submits and Shift+Return adds a newline.
+  it. On iOS, verify Return submits Quick Question while Return in the normal
+  prompt adds a newline. In the Mac workspace, verify Return submits and
+  Shift+Return adds a newline.
 - Check Command+N both with a workspace open and after closing every workspace.
   Command+Shift+N must open another window even when one already exists, and
   Command+Option+N must start a search without opening a window.

server/src/llm/provider-adapters.ts

@@ -95,7 +95,7 @@ function isLikelyResponsesApiModel(model: string) {
   if (id.includes("audio") || id.includes("realtime") || id.includes("transcribe") || id.includes("tts")) return false;
   if (id.includes("image") || id.includes("dall-e") || id.includes("sora")) return false;
   if (id.includes("search") || id.includes("computer-use")) return false;
-  return /^(gpt-|o\d|chatgpt-)/.test(id);
+  return id === "chat-latest" || /^(gpt-|o\d|chatgpt-)/.test(id);
 }
 
 function isLikelyGeminiChatModel(model: string) {

server/tests/provider-adapters.test.ts

@@ -1,6 +1,50 @@
 import assert from "node:assert/strict";
 import test from "node:test";
-import { describeProviderChatBackend } from "../src/llm/provider-adapters.js";
+import { env } from "../src/env.js";
+import { describeProviderChatBackend, fetchProviderCatalogModels } from "../src/llm/provider-adapters.js";
+
+for (const { name, listedModels, expectedModels } of [
+  {
+    name: "OpenAI catalog includes chat-latest while excluding non-chat models",
+    listedModels: [
+      "gpt-4.1-mini",
+      "chat-latest",
+      "o3",
+      "chatgpt-4o-latest",
+      "chat-latest",
+      "text-embedding-3-small",
+      "omni-moderation-latest",
+      "gpt-4o-audio-preview",
+      "gpt-realtime",
+      "gpt-4o-transcribe",
+      "gpt-4o-mini-tts",
+      "gpt-image-1",
+      "chatgpt-image-latest",
+      "gpt-4o-search-preview",
+      "computer-use-preview",
+      "sora-2",
+    ],
+    expectedModels: ["chat-latest", "chatgpt-4o-latest", "gpt-4.1-mini", "o3"],
+  },
+  {
+    name: "OpenAI catalog does not invent models absent from the provider response",
+    listedModels: ["gpt-4.1-mini"],
+    expectedModels: ["gpt-4.1-mini"],
+  },
+]) {
+  test(name, async (t) => {
+    const originalKey = env.OPENAI_API_KEY;
+    env.OPENAI_API_KEY = "test-openai-key";
+    t.after(() => { env.OPENAI_API_KEY = originalKey; });
+    t.mock.method(globalThis, "fetch", async (input: RequestInfo | URL) => {
+      const url = input instanceof Request ? input.url : String(input);
+      assert.equal(url, "https://api.openai.com/v1/models");
+      return Response.json({ data: listedModels.map((id) => ({ id })) });
+    });
+
+    assert.deepEqual(await fetchProviderCatalogModels("openai"), expectedModels);
+  });
+}
 
 test("provider backend registry selects chat protocol and managed-tool mode", () => {
   assert.deepEqual(describeProviderChatBackend("openai", []), {

web/src/App.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useRef, useState } from "preact/hooks";
+import { useEffect, useLayoutEffect, useMemo, useRef, useState } from "preact/hooks";
 import type { TargetedTouchEvent } from "preact";
 import {
   Check,
@@ -80,7 +80,7 @@ import {
   resolveSidebarSelectionAfterRefresh,
   type SidebarSelection,
 } from "@/lib/sidebar-selection";
-import { buildQuickQuestionRequest } from "@/lib/quick-question";
+import { buildQuickQuestionRequest, pickQuickQuestionModel, QUICK_QUESTION_DEFAULT_MODEL } from "@/lib/quick-question";
 import {
   appendStreamingDelta,
   clearStreamingAssistantTrace,
@@ -161,7 +161,7 @@ function buildWorkspaceUrl(selection: SidebarSelection | null) {
 }
 
 const PROVIDER_FALLBACK_MODELS: Record<Provider, string[]> = {
-  openai: ["gpt-4.1-mini"],
+  openai: ["gpt-4.1-mini", QUICK_QUESTION_DEFAULT_MODEL],
   anthropic: ["claude-3-5-sonnet-latest"],
   xai: ["grok-3-mini"],
   gemini: ["gemini-3.5-flash", "gemini-flash-latest"],
@@ -654,9 +654,10 @@ type ModelComboboxProps = {
   value: string;
   onChange: (value: string) => void;
   disabled?: boolean;
+  className?: string;
 };
 
-function ModelCombobox({ options, value, onChange, disabled = false }: ModelComboboxProps) {
+function ModelCombobox({ options, value, onChange, disabled = false, className }: ModelComboboxProps) {
   const [open, setOpen] = useState(false);
   const [draftValue, setDraftValue] = useState(value);
   const rootRef = useRef<HTMLDivElement>(null);
@@ -710,7 +711,12 @@ function ModelCombobox({ options, value, onChange, disabled = false }: ModelComb
 
   return (
     <div className="relative" ref={rootRef}>
-      <div className="flex h-10 min-w-56 items-center rounded-lg border border-violet-300/22 bg-background/72 px-3 text-sm shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)]">
+      <div
+        className={cn(
+          "flex h-10 min-w-56 items-center rounded-lg border border-violet-300/22 bg-background/72 px-3 text-sm shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)]",
+          className
+        )}
+      >
         <input
           ref={inputRef}
           value={draftValue}
@@ -948,7 +954,6 @@ export default function App() {
     isCheckingSession,
     isSigningIn,
     isAuthenticated,
-    authMode,
     authError,
     handleAuthFailure: baseHandleAuthFailure,
     handleSignIn,
@@ -986,7 +991,7 @@ export default function App() {
   );
   const [quickModel, setQuickModel] = useState(() => {
     const stored = loadStoredQuickQuestionModelSelection();
-    return stored.modelPreferences[stored.provider] ?? PROVIDER_FALLBACK_MODELS[stored.provider][0];
+    return pickQuickQuestionModel(stored.provider, PROVIDER_FALLBACK_MODELS[stored.provider], stored.modelPreferences[stored.provider]);
   });
   const [isQuickQuestionOpen, setIsQuickQuestionOpen] = useState(false);
   const [quickPrompt, setQuickPrompt] = useState("");
@@ -1018,6 +1023,7 @@ export default function App() {
   const transcriptEndRef = useRef<HTMLDivElement>(null);
   const contextMenuRef = useRef<HTMLDivElement>(null);
   const renameChatInputRef = useRef<HTMLInputElement>(null);
+  const chatSettingsDialogRef = useRef<HTMLDialogElement>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
   const dragDepthRef = useRef(0);
   const pendingAttachmentsRef = useRef<ChatAttachment[]>([]);
@@ -1443,7 +1449,7 @@ export default function App() {
   useEffect(() => {
     if (quickModel.trim()) return;
     setQuickModel((current) => {
-      return current.trim() || pickProviderModel(quickProviderModelOptions, quickProviderModelPreferences[quickProvider]);
+      return current.trim() || pickQuickQuestionModel(quickProvider, quickProviderModelOptions, quickProviderModelPreferences[quickProvider]);
     });
   }, [quickModel, quickProvider, quickProviderModelOptions, quickProviderModelPreferences]);
 
@@ -1930,6 +1936,7 @@ export default function App() {
     if (!isAuthenticated) return;
 
     const handleKeyDown = (event: KeyboardEvent) => {
+      if (chatSettingsDialogRef.current?.open) return;
       const hasPrimaryModifier = event.metaKey || event.ctrlKey;
       if (!hasPrimaryModifier || event.altKey) return;
 
@@ -2331,16 +2338,16 @@ export default function App() {
     return () => window.clearTimeout(timer);
   }, [renameChatDialog]);
 
-  useEffect(() => {
+  useLayoutEffect(() => {
     if (!isChatSettingsOpen) return;
-    const handleKeyDown = (event: KeyboardEvent) => {
-      if (event.key !== "Escape" || isSavingChatSettings) return;
-      event.preventDefault();
-      setIsChatSettingsOpen(false);
+    const dialog = chatSettingsDialogRef.current;
+    const previouslyFocused = document.activeElement;
+    dialog?.showModal();
+    return () => {
+      dialog?.close();
+      if (previouslyFocused instanceof HTMLElement) previouslyFocused.focus({ preventScroll: true });
     };
-    window.addEventListener("keydown", handleKeyDown);
-    return () => window.removeEventListener("keydown", handleKeyDown);
-  }, [isChatSettingsOpen, isSavingChatSettings]);
+  }, [isChatSettingsOpen]);
 
   useEffect(() => {
     if (!isQuickQuestionOpen) return;
@@ -3433,7 +3440,7 @@ export default function App() {
 
   return (
     <div className="app-grid-surface app-safe-frame h-full">
-      <div className="workspace-shell flex h-full w-full overflow-hidden bg-transparent md:gap-2">
+      <div className="workspace-shell flex h-full w-full overflow-hidden bg-transparent">
         {isMobileSidebarOpen ? (
           <button
             type="button"
@@ -3445,19 +3452,13 @@ export default function App() {
 
         <aside
           className={cn(
-            "workspace-sidebar glass-panel fixed inset-y-0 left-0 z-40 flex w-[86vw] max-w-80 shrink-0 flex-col border-r border-violet-300/18 transition-transform md:static md:z-auto md:w-80 md:max-w-none md:rounded-2xl md:border",
+            "workspace-sidebar glass-panel fixed inset-y-0 left-0 z-40 flex w-[86vw] max-w-80 shrink-0 flex-col border-r border-violet-300/18 transition-transform md:static md:z-auto md:w-80 md:max-w-none",
             isMobileSidebarOpen ? "translate-x-0" : "-translate-x-full md:translate-x-0"
           )}
         >
-          <div className="relative min-h-24 px-4 pb-4 pt-5">
-            <div className="pr-24">
-              <div className="sybil-wordmark bg-[linear-gradient(90deg,#ff8df8,#9a6dff_54%,#67dfff)] bg-clip-text text-3xl text-transparent">
-                SYBIL
-              </div>
-              <p className="mt-2 flex items-center gap-1.5 text-xs font-medium text-muted-foreground">
-                <span className="h-1.5 w-1.5 rounded-full bg-emerald-400" />
-                Sybil Web{authMode ? ` (${authMode === "open" ? "open mode" : "token mode"})` : ""}
-              </p>
+          <div className="relative min-h-24 px-4 pb-4 pt-5 flex items-center">
+            <div className="sybil-wordmark bg-[linear-gradient(90deg,#ff8df8,#9a6dff_54%,#67dfff)] bg-clip-text text-3xl text-transparent">
+              SYBIL
             </div>
             <SybilCharacter
               className="absolute right-4 top-3 h-[calc(100%-1.5rem)]"
@@ -3608,7 +3609,7 @@ export default function App() {
         </aside>
 
         <main
-          className="workspace-content glass-panel relative flex min-w-0 flex-1 touch-pan-y flex-col overflow-hidden border-violet-300/18 md:touch-auto md:rounded-2xl md:border"
+          className="workspace-content glass-panel relative flex min-w-0 flex-1 touch-pan-y flex-col overflow-hidden md:touch-auto"
           onTouchStart={handleMobileWorkspaceTouchStart}
           onTouchMove={handleMobileWorkspaceTouchMove}
           onTouchEnd={handleMobileWorkspaceTouchEnd}
@@ -3822,44 +3823,66 @@ export default function App() {
         </div>
       ) : null}
       {isChatSettingsOpen ? (
-        <div
-          className="fixed inset-0 z-[60] flex items-center justify-center bg-black/72 p-3 backdrop-blur-md md:p-6"
+        <dialog
+          ref={chatSettingsDialogRef}
+          aria-labelledby="chat-settings-title"
+          className="fixed inset-0 m-0 flex h-dvh max-h-none w-full max-w-none items-center justify-center overflow-hidden bg-transparent p-0 text-foreground backdrop:bg-black/70 backdrop:backdrop-blur-md md:p-6"
+          onCancel={(event) => {
+            event.preventDefault();
+            if (!isSavingChatSettings) setIsChatSettingsOpen(false);
+          }}
           onMouseDown={(event) => {
             if (event.target === event.currentTarget && !isSavingChatSettings) setIsChatSettingsOpen(false);
           }}
         >
           <form
-            role="dialog"
-            aria-modal="true"
-            aria-labelledby="chat-settings-title"
-            className="glass-panel flex max-h-[88vh] w-full max-w-2xl flex-col rounded-2xl border border-violet-300/24 p-4 shadow-2xl shadow-black/45 md:p-5"
+            className="glass-panel flex h-full min-h-0 w-full flex-col overflow-hidden md:h-auto md:max-h-full md:max-w-2xl md:rounded-2xl md:border md:border-violet-300/24"
             onSubmit={(event) => void handleChatSettingsSubmit(event)}
           >
-            <div className="mb-4 flex items-center justify-between gap-3">
+            <div className="chat-settings-header grid shrink-0 grid-cols-[minmax(0,1fr)_auto_minmax(0,1fr)] items-center gap-2 border-b border-violet-300/16 md:flex md:justify-between md:gap-3">
+              <Button
+                type="button"
+                variant="ghost"
+                className="h-11 justify-self-start px-2 text-violet-200 hover:bg-violet-400/10 hover:text-violet-100 md:hidden"
+                onClick={() => setIsChatSettingsOpen(false)}
+                disabled={isSavingChatSettings}
+              >
+                Cancel
+              </Button>
               <div className="min-w-0">
-                <h2 id="chat-settings-title" className="text-sm font-semibold text-violet-50">
+                <h2 id="chat-settings-title" className="text-base font-semibold text-violet-50 md:text-sm">
                   Chat settings
                 </h2>
-                <p className="mt-1 truncate text-xs text-muted-foreground">{chatSettingsTitleDraft.trim() || "New chat"}</p>
+                <p className="mt-1 hidden truncate text-xs text-muted-foreground md:block">{chatSettingsTitleDraft.trim() || "New chat"}</p>
               </div>
               <Button
                 type="button"
                 size="icon"
                 variant="ghost"
-                className="h-8 w-8"
+                className="hidden h-8 w-8 shrink-0 md:inline-flex"
                 onClick={() => setIsChatSettingsOpen(false)}
                 disabled={isSavingChatSettings}
                 aria-label="Close chat settings"
               >
                 <X className="h-4 w-4" />
               </Button>
+              <Button
+                type="submit"
+                variant="ghost"
+                className="h-11 justify-self-end gap-1.5 px-2 font-semibold text-violet-200 hover:bg-violet-400/10 hover:text-violet-100 md:hidden"
+                disabled={isSavingChatSettings}
+              >
+                {isSavingChatSettings ? <LoaderCircle className="h-4 w-4 animate-spin" /> : null}
+                Save
+              </Button>
             </div>
 
-            <div className="min-h-0 flex-1 space-y-4 overflow-y-auto pr-1">
+            <div className="chat-settings-content min-h-0 flex-1 space-y-5 overflow-y-auto overscroll-contain md:space-y-4">
               <div>
-                <span className="mb-1.5 block text-xs font-semibold text-violet-100/72">Chat title</span>
+                <label for="chat-settings-chat-title" className="mb-1.5 block text-xs font-semibold text-violet-100/72">Chat title</label>
                 <div className="flex items-center gap-2">
                   <input
+                    id="chat-settings-chat-title"
                     value={chatSettingsTitleDraft}
                     onInput={(event) => {
                       setChatSettingsTitleDraft(event.currentTarget.value);
@@ -3867,7 +3890,7 @@ export default function App() {
                     }}
                     maxLength={120}
                     placeholder={draftKind === null && selectedItem?.kind === "chat" ? "Chat title" : "Optional title"}
-                    className="h-11 min-w-0 flex-1 rounded-lg border border-violet-300/22 bg-background/72 px-3 text-sm text-violet-50 outline-none shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)] placeholder:text-muted-foreground focus:border-violet-300/45 focus:ring-1 focus:ring-ring/70"
+                    className="h-11 min-w-0 flex-1 rounded-lg border border-violet-300/22 bg-background/70 px-3 text-base text-violet-50 outline-none shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)] placeholder:text-muted-foreground focus:border-violet-300/45 focus:ring-1 focus:ring-ring/70 md:text-sm"
                     disabled={isSavingChatSettings}
                   />
                   {chatSettingsChatId ? (
@@ -3895,7 +3918,7 @@ export default function App() {
                 <label className="block">
                   <span className="mb-1.5 block text-xs font-semibold text-violet-100/72">Provider</span>
                   <select
-                    className="h-10 w-full rounded-lg border border-violet-300/22 bg-background/72 px-3 text-sm text-violet-50 outline-none shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)] focus:border-violet-300/45 focus:ring-1 focus:ring-ring/70"
+                    className="h-11 w-full rounded-lg border border-violet-300/22 bg-background/70 px-3 text-base text-violet-50 outline-none shadow-[inset_0_1px_0_hsl(255_100%_92%_/_0.06)] focus:border-violet-300/45 focus:ring-1 focus:ring-ring/70 md:h-10 md:text-sm"
                     value={chatSettingsProviderDraft}
                     onChange={(event) => {
                       const nextProvider = event.currentTarget.value as Provider;
@@ -3917,6 +3940,7 @@ export default function App() {
                 <label className="block min-w-0">
                   <span className="mb-1.5 block text-xs font-semibold text-violet-100/72">Model</span>
                   <ModelCombobox
+                    className="h-11 min-w-0 bg-background/70 text-base md:h-10 md:text-sm"
                     options={chatSettingsProviderModelOptions}
                     value={chatSettingsModelDraft}
                     disabled={isSavingChatSettings}
@@ -3938,7 +3962,7 @@ export default function App() {
                     if (chatSettingsError) setChatSettingsError(null);
                   }}
                   placeholder="Add per-chat instructions"
-                  className="min-h-32 resize-y border-violet-300/24 bg-background/72 text-sm text-violet-50 placeholder:text-violet-200/45"
+                  className="min-h-32 resize-y border-violet-300/24 bg-background/70 text-base text-violet-50 placeholder:text-violet-200/45 md:text-sm"
                   disabled={isSavingChatSettings}
                 />
               </label>
@@ -3952,6 +3976,7 @@ export default function App() {
                         type="button"
                         size="sm"
                         variant="secondary"
+                        className="h-11 gap-1.5 md:h-8"
                         onClick={() => setChatSettingsEnabledToolsDraft(getDefaultEnabledTools(availableChatTools))}
                         disabled={isSavingChatSettings}
                       >
@@ -3962,6 +3987,7 @@ export default function App() {
                         type="button"
                         size="sm"
                         variant="secondary"
+                        className="h-11 gap-1.5 md:h-8"
                         onClick={() => setChatSettingsEnabledToolsDraft([])}
                         disabled={isSavingChatSettings}
                       >
@@ -3971,31 +3997,30 @@ export default function App() {
                     </div>
                   ) : null}
                 </div>
-                <div className="space-y-2">
+                <div className="grid gap-2 md:grid-cols-2">
                   {availableChatTools.length ? (
                     availableChatTools.map((tool) => {
                       const checked = chatSettingsEnabledToolsDraft.includes(tool.name);
                       return (
                         <label
                           key={tool.name}
-                          className="flex cursor-pointer items-start gap-3 rounded-lg border border-violet-300/18 bg-background/44 px-3 py-2.5 transition hover:border-violet-300/34 hover:bg-violet-400/8"
+                          title={tool.description}
+                          className="flex min-h-11 min-w-0 cursor-pointer items-center gap-3 rounded-lg border border-violet-300/18 bg-background/44 px-3 py-2.5 transition hover:border-violet-300/34 hover:bg-violet-400/8 focus-within:border-violet-300/45 focus-within:ring-1 focus-within:ring-ring/70"
                         >
                           <input
                             type="checkbox"
                             checked={checked}
                             onChange={() => toggleChatSettingsTool(tool.name)}
-                            className="mt-1 h-4 w-4 rounded border-violet-300/35 bg-background/80 accent-violet-400"
+                            className="h-4 w-4 shrink-0 rounded border-violet-300/35 bg-background/80 accent-violet-400"
+                            aria-description={tool.description}
                             disabled={isSavingChatSettings}
                           />
-                          <span className="min-w-0">
-                            <span className="block text-sm font-medium text-violet-50">{getToolLabel(tool.name)}</span>
-                            <span className="mt-0.5 block text-xs leading-5 text-muted-foreground">{tool.description}</span>
-                          </span>
+                          <span className="min-w-0 break-words text-sm font-medium text-violet-50">{getToolLabel(tool.name)}</span>
                         </label>
                       );
                     })
                   ) : (
-                    <p className="rounded-lg border border-violet-300/18 bg-background/44 px-3 py-2.5 text-sm text-muted-foreground">
+                    <p className="rounded-lg border border-violet-300/18 bg-background/44 px-3 py-2.5 text-sm text-muted-foreground md:col-span-2">
                       No chat tools are available.
                     </p>
                   )}
@@ -4003,8 +4028,8 @@ export default function App() {
               </section>
             </div>
 
-            {chatSettingsError ? <p className="mt-3 text-sm text-rose-300">{chatSettingsError}</p> : null}
-            <div className="mt-4 flex justify-end gap-2">
+            {chatSettingsError ? <p role="alert" className="chat-settings-error shrink-0 break-words border-t border-violet-300/16 text-sm text-rose-300">{chatSettingsError}</p> : null}
+            <div className="hidden shrink-0 justify-end gap-2 border-t border-violet-300/16 p-5 md:flex">
               <Button type="button" variant="secondary" onClick={() => setIsChatSettingsOpen(false)} disabled={isSavingChatSettings}>
                 Cancel
               </Button>
@@ -4014,7 +4039,7 @@ export default function App() {
               </Button>
             </div>
           </form>
-        </div>
+        </dialog>
       ) : null}
       {renameChatDialog ? (
         <div
@@ -4073,7 +4098,7 @@ export default function App() {
       ) : null}
       {isQuickQuestionOpen ? (
         <div
-          className="fixed inset-0 z-[60] flex items-center justify-center bg-black/72 p-3 backdrop-blur-md md:p-6"
+          className="fixed inset-0 z-[60] flex items-center justify-center bg-black/40 p-3 md:p-6"
           onMouseDown={(event) => {
             if (event.target === event.currentTarget) setIsQuickQuestionOpen(false);
           }}
@@ -4151,7 +4176,7 @@ export default function App() {
                     const nextProvider = event.currentTarget.value as Provider;
                     setQuickProvider(nextProvider);
                     const options = getModelOptions(modelCatalog, nextProvider);
-                    setQuickModel(pickProviderModel(options, quickProviderModelPreferences[nextProvider]));
+                    setQuickModel(pickQuickQuestionModel(nextProvider, options, quickProviderModelPreferences[nextProvider]));
                   }}
                   disabled={isQuickQuestionSending || isConvertingQuickQuestion}
                   aria-label="Quick question provider"

web/src/components/chat/chat-messages-panel.tsx

@@ -378,13 +378,13 @@ function ToolCallStack({
           );
         })}
         {!expanded && hiddenCount ? (
-          <span className="absolute bottom-1 right-10 z-20 rounded-full border border-cyan-300/30 bg-slate-950/86 px-2 py-0.5 text-[10px] font-semibold leading-none text-cyan-100 shadow-sm">
+          <span className="absolute bottom-1 right-10 z-20 rounded-none border border-cyan-300/30 bg-slate-950/86 px-2 py-0.5 text-[10px] font-semibold leading-none text-cyan-100 shadow-sm">
             +{hiddenCount}
           </span>
         ) : null}
         <button
           type="button"
-          className="tool-call-stack-toggle absolute right-0 top-2 z-20 flex h-8 w-8 items-center justify-center rounded-full"
+          className="tool-call-stack-toggle absolute right-0 top-2 z-20 flex h-8 w-8 items-center justify-center rounded-none"
           aria-expanded={expanded ? "true" : "false"}
           aria-label={`${expanded ? "Collapse" : "Expand"} ${countLabel}`}
           title={`${expanded ? "Collapse" : "Expand"} ${countLabel}`}
@@ -603,7 +603,7 @@ export function ChatMessagesPanel({ messages, isLoading, isSending, onMessageCon
                 className={cn(
                   "max-w-[85%] space-y-3",
                   isUser
-                    ? "rounded-xl border border-violet-300/24 bg-[linear-gradient(135deg,hsl(258_86%_48%_/_0.86),hsl(278_72%_29%_/_0.86))] px-4 py-3 text-sm leading-6 text-fuchsia-50 shadow-sm"
+                    ? "chat-user-message border border-violet-300/24 bg-[linear-gradient(135deg,hsl(258_86%_48%_/_0.86),hsl(278_72%_29%_/_0.86))] px-4 py-3 text-sm leading-6 text-fuchsia-50 shadow-sm"
                     : "text-base leading-7 text-violet-50"
                 )}
                 onContextMenu={

web/src/index.css

@@ -31,7 +31,7 @@
   --secondary-foreground: 254 38% 94%;
   --accent: 188 86% 50%;
   --accent-foreground: 230 45% 8%;
-  --radius: 0.5rem;
+  --radius: 0px;
 }
 
 * {
@@ -72,6 +72,7 @@ select,
 textarea {
   font: inherit;
   color-scheme: dark;
+  border-radius: var(--radius);
 }
 
 ::selection {
@@ -113,13 +114,39 @@ textarea {
     max(0.75rem, var(--safe-area-left));
 }
 
+.chat-settings-header {
+  padding:
+    calc(0.5rem + var(--safe-area-top))
+    max(0.75rem, var(--safe-area-right))
+    0.5rem
+    max(0.75rem, var(--safe-area-left));
+}
+
+.chat-settings-content {
+  padding:
+    1rem
+    max(1rem, var(--safe-area-right))
+    max(1.5rem, var(--safe-area-bottom))
+    max(1rem, var(--safe-area-left));
+  scroll-padding-block: 1rem;
+}
+
+.chat-settings-error {
+  padding:
+    0.75rem
+    max(1rem, var(--safe-area-right))
+    max(0.75rem, var(--safe-area-bottom))
+    max(1rem, var(--safe-area-left));
+}
+
 @media (min-width: 768px) {
-  .app-safe-frame {
-    padding:
-      max(0.5rem, var(--safe-area-top))
-      max(0.5rem, var(--safe-area-right))
-      max(0.5rem, var(--safe-area-bottom))
-      max(0.5rem, var(--safe-area-left));
+  .chat-settings-header,
+  .chat-settings-content {
+    padding: 1.25rem;
+  }
+
+  .chat-settings-error {
+    padding: 0.75rem 1.25rem;
   }
 
   .app-search-safe-pad {
@@ -132,19 +159,11 @@ textarea {
 }
 
 @media (horizontal-viewport-segments: 2) {
-  .app-safe-frame {
-    padding:
-      max(0.5rem, var(--safe-area-top))
-      max(0.5rem, var(--safe-area-right))
-      max(0.5rem, var(--safe-area-bottom))
-      max(0.5rem, var(--safe-area-left));
-  }
-
   .workspace-shell {
     display: grid;
     grid-template-columns:
-      calc(env(viewport-segment-width 0 0) - max(0.5rem, var(--safe-area-left)))
-      calc(env(viewport-segment-width 1 0) - max(0.5rem, var(--safe-area-right)));
+      calc(env(viewport-segment-width 0 0) - var(--safe-area-left))
+      calc(env(viewport-segment-width 1 0) - var(--safe-area-right));
     column-gap: calc(env(viewport-segment-left 1 0) - env(viewport-segment-right 0 0));
   }
 
@@ -153,14 +172,10 @@ textarea {
     width: 100%;
     max-width: none;
     transform: none;
-    border-width: 1px;
-    border-radius: 1rem;
   }
 
   .workspace-content {
     min-width: 0;
-    border-width: 1px;
-    border-radius: 1rem;
     touch-action: auto;
   }
 
@@ -179,6 +194,13 @@ textarea {
     0 14px 36px hsl(240 80% 2% / 0.28);
 }
 
+.chat-user-message {
+  /* Preserve the original bubble radius independently of the square UI theme.
+     Browsers without corner-shape support fall back to circular corners. */
+  border-radius: 0.75rem;
+  corner-shape: squircle;
+}
+
 .tool-call-stack-shell {
   perspective: 900px;
   transform-style: preserve-3d;
@@ -430,7 +452,7 @@ textarea {
   overflow-x: auto;
   overflow-y: hidden;
   border: 1px solid hsl(var(--border) / 0.86);
-  border-radius: 0.625rem;
+  border-radius: var(--radius);
   background: hsl(246 34% 10% / 0.76);
   box-shadow: inset 0 1px 0 hsl(258 80% 88% / 0.06);
 }
@@ -449,7 +471,7 @@ textarea {
 }
 
 .md-table-scroll::-webkit-scrollbar-thumb {
-  border-radius: 9999px;
+  border-radius: var(--radius);
   background: hsl(263 78% 72% / 0.34);
 }
 
@@ -561,7 +583,7 @@ textarea {
 
 .md-content code {
   background: hsl(249 40% 10% / 0.78);
-  border-radius: 0.3rem;
+  border-radius: var(--radius);
   padding: 0.05rem 0.3rem;
   font-size: 0.86em;
   box-decoration-break: clone;
@@ -571,7 +593,7 @@ textarea {
 .md-content pre {
   overflow-x: auto;
   border: 1px solid hsl(253 31% 29% / 0.72);
-  border-radius: 0.625rem;
+  border-radius: var(--radius);
   background: hsl(249 40% 10% / 0.82);
   padding: 0.75rem;
   box-shadow: inset 0 1px 0 hsl(258 80% 88% / 0.05);
@@ -595,7 +617,7 @@ textarea {
 .md-cite-token {
   display: inline-flex;
   align-items: center;
-  border-radius: 9999px;
+  border-radius: var(--radius);
   border: 1px solid hsl(274 40% 55%);
   background: hsl(277 33% 21%);
   color: hsl(304 42% 96%);

web/src/lib/quick-question.ts

@@ -1,5 +1,13 @@
 import type { Provider } from "./api";
 
+export const QUICK_QUESTION_DEFAULT_MODEL = "chat-latest";
+
+export function pickQuickQuestionModel(provider: Provider, options: string[], preferred: string | null = null) {
+  if (preferred?.trim()) return preferred.trim();
+  if (provider === "openai") return QUICK_QUESTION_DEFAULT_MODEL;
+  return options[0] ?? "";
+}
+
 export function buildQuickQuestionRequest({
   provider,
   model,

web/tailwind.config.ts

@@ -29,9 +29,14 @@ const config: Config = {
         },
       },
       borderRadius: {
+        // Keep surfaces square at every size; rounded-full is reserved for dots.
+        DEFAULT: "var(--radius)",
+        sm: "var(--radius)",
+        md: "var(--radius)",
         lg: "var(--radius)",
-        md: "calc(var(--radius) - 2px)",
-        sm: "calc(var(--radius) - 4px)",
+        xl: "var(--radius)",
+        "2xl": "var(--radius)",
+        "3xl": "var(--radius)",
       },
     },
   },

web/tests/quick-question.test.mjs

@@ -1,6 +1,27 @@
 import assert from "node:assert/strict";
 import test from "node:test";
-import { buildQuickQuestionRequest } from "../src/lib/quick-question.ts";
+import { buildQuickQuestionRequest, pickQuickQuestionModel } from "../src/lib/quick-question.ts";
+
+test("quick questions default to chat-latest before and after the model catalog loads", () => {
+  for (const options of [[], ["gpt-4.1-mini"], ["gpt-4.1-mini", "chat-latest"]]) {
+    const model = pickQuickQuestionModel("openai", options);
+    assert.equal(model, "chat-latest");
+    assert.deepEqual(buildQuickQuestionRequest({ provider: "openai", model, content: "What is UTC?" }), {
+      provider: "openai",
+      model: "chat-latest",
+      question: "What is UTC?",
+    });
+  }
+});
+
+test("quick questions preserve saved models and use provider-specific choices when switching providers", () => {
+  assert.equal(pickQuickQuestionModel("openai", ["chat-latest"], " gpt-4.1-mini "), "gpt-4.1-mini");
+  assert.equal(pickQuickQuestionModel("openai", ["gpt-4.1-mini"], " "), "chat-latest");
+  assert.equal(pickQuickQuestionModel("anthropic", ["claude-3-5-sonnet-latest"]), "claude-3-5-sonnet-latest");
+  assert.equal(pickQuickQuestionModel("anthropic", ["claude-3-5-sonnet-latest"], "claude-3-haiku"), "claude-3-haiku");
+  assert.equal(pickQuickQuestionModel("anthropic", []), "");
+  assert.equal(pickQuickQuestionModel("openai", ["gpt-4.1-mini", "chat-latest"]), "chat-latest");
+});
 
 test("quick question requests use the dedicated server endpoint shape", () => {
   const request = buildQuickQuestionRequest({