Run on GLM 5.2 only; remove other models and the model selector

CLAUDE.md

@@ -80,7 +80,7 @@ This boundary is **enforced by Next.js bundling at build time** (importing `pg`/
 
 1. `OPERATING INSTRUCTIONS` — `DEFAULT_OPERATING_INSTRUCTION` (`src/lib/shared/llm/system-instructions.ts`)
 2. `RUNTIME DATE CONTEXT` — current UTC timestamp + user timezone (from `X-User-Timezone` header)
-3. **Provider overlay** (`PROVIDER OVERLAY: ALIBABA|MOONSHOTAI`) — keyed by the model's **provider org**, not its nickname (alibaba=Qwen, moonshotai=Kimi). Always applied for a supported model.
+3. **Provider overlay** (`PROVIDER OVERLAY: ZAI`) — keyed by the model's **provider org** (zai=GLM). Always applied for the supported model. `resolvePromptProvider()` is param-less and always returns `"zai"`.
 4. `IDENTITY AND TONE CONTEXT` — `DEFAULT_SOUL_FALLBACK_INSTRUCTION` (`src/lib/shared/llm/system-instructions.ts`)
 5. `AUTH USER CONTEXT` — authenticated user id, name, email
 
@@ -136,16 +136,15 @@ The only tools are the two Tavily web-search tools, and both are registered toge
 
 ### Model Registry
 
-All models are defined in `src/lib/shared/llm/models.ts`:
+The app runs on a **single model**, defined in `src/lib/shared/llm/models.ts`:
 
-| Key                    | Model ID               | Display Name |
-| ---------------------- | ---------------------- | ------------ |
-| `ALIBABA_QWEN3_7_MAX`  | `alibaba/qwen3.7-max`  | Qwen 3.7 Max |
-| `MOONSHOTAI_KIMI_K2_6` | `moonshotai/kimi-k2.6` | Kimi K2.6    |
+| Key           | Model ID      | Display Name |
+| ------------- | ------------- | ------------ |
+| `ZAI_GLM_5_2` | `zai/glm-5.2` | GLM 5.2      |
 
-- `MODEL_SELECTOR_MODELS` — the chat selector subset: Qwen 3.7 Max and Kimi K2.6.
+- `DEFAULT_MODEL` (`= AvailableModels.ZAI_GLM_5_2`) is the single model used everywhere. There is **no model-selector UI** and no per-user model persistence — the client always submits `DEFAULT_MODEL`, and the model still flows through requests/threads so the API can validate it.
 - The agent is text-only: all chat input is plain text (no image, file, or PDF input).
-- Adding a model means updating `AvailableModels`, `ModelInfos`, `SUPPORTED_MODELS`, and optionally `MODEL_SELECTOR_MODELS`. `/api/models` filters this registry by configured keys (`getModels()` in `src/lib/actions/api-keys.ts`).
+- Adding a model means updating `AvailableModels`, `ModelInfos`, and `SUPPORTED_MODELS` (and re-introducing selector UI if more than one model is ever exposed). `/api/models` filters this registry by configured keys (`getModels()` in `src/lib/actions/api-keys.ts`).
 
 ### Thread Storage
 
@@ -240,7 +239,7 @@ src/
                         #   follow-up-questions
     agent/messages/     # Message rendering (user, assistant, queued, activity timeline)
     agent/markdown/     # Memoized markdown renderer
-    agent/prompt-form/  # PromptForm, ModelSelector
+    agent/prompt-form/  # PromptForm (single model; no selector)
     app-sidebar.tsx     # Sidebar shell (lazy-loads SearchChats + NavThreads)
     nav-threads.tsx     # Thread list + client-side pinning (localStorage)
     nav-user.tsx        # Account menu + sign-out
@@ -250,15 +249,14 @@ src/
     layout/             # route group layout
     ui/                 # shadcn/ui primitives (base-lyra/stone) + ShikiCode
   hooks/
-    agent/              # use-models (server-seeded models context),
-                        #   use-persistent-selected-model (localStorage-backed)
+    agent/              # use-models (server-seeded models context)
   lib/
     actions/api-keys.ts # getModels() server action
     brand/colors.ts     # App brand colors (used by layout/manifest)
     editor/highlighter.ts
     server/
       agent-context.ts          # buildAgentSystemInstruction
-      agent-prompt-steering.ts  # Provider overlays (Qwen/Kimi tuning)
+      agent-prompt-steering.ts  # Provider overlay (GLM tuning)
       agent-route.ts            # parseAgentStreamRequest, createAgentStreamResponse
       agent-runtime-config.ts   # Runtime constants (no env knobs)
       auth.ts / auth-session.ts # isAuthConfigured, getRequestSession
@@ -280,7 +278,7 @@ src/
       agent/messages.ts          # AgentStreamEvent, Message, ToolInvocation, run statuses
       agent/reasoning-privacy.ts # sanitizeReasoningForDisplay
       agent-request-limits.ts    # Message/char limit defaults
-      llm/models.ts              # AvailableModels, ModelInfos, SUPPORTED/SELECTOR/RESEARCH
+      llm/models.ts              # AvailableModels, ModelInfos, SUPPORTED_MODELS, DEFAULT_MODEL
       llm/system-instructions.ts # DEFAULT_OPERATING_INSTRUCTION, DEFAULT_SOUL_FALLBACK_INSTRUCTION
       threads.ts                 # Thread type, sort/normalize/deriveThreadTitle
   proxy.ts                # Next.js middleware (named export `proxy` + `config`)
@@ -357,5 +355,5 @@ Request size limits, stream/gateway timeouts, tool-step budgets, and body-size l
 - The **mock smoke test uses the production server** (`next start`), so build first.
 - `pnpm.onlyBuiltDependencies` already approves the `sharp` build script — do not run `pnpm approve-builds`.
 - Don't reintroduce Sentry/PostHog/OpenTelemetry; they were intentionally removed in favor of Vercel Analytics/Speed Insights + structured logs.
-- Pinning and selected model are **client-side localStorage** — there are no server columns or APIs for them.
+- Pinning is **client-side localStorage** — there is no server column or API for it. There is no model selection or persistence: the app runs on the single `DEFAULT_MODEL` (GLM 5.2).
 - After signing up via `/api/auth/sign-up/email`, the session cookie is set automatically; no separate sign-in is needed.

README.md

@@ -1,6 +1,6 @@
 # Chloei
 
-Chloei is a Next.js 16 chat app backed by Vercel AI Gateway. It currently exposes a curated model selector that defaults to Qwen 3.7 Max and also includes Kimi K2.6, and offers optional Tavily web search and Better Auth email/password authentication with PostgreSQL-backed users and sessions.
+Chloei is a Next.js 16 chat app backed by Vercel AI Gateway. It runs on a single model — GLM 5.2 (`zai/glm-5.2`) — and offers optional Tavily web search and Better Auth email/password authentication with PostgreSQL-backed users and sessions.
 
 ## Documentation
 

src/app/(home)/page.tsx

@@ -5,10 +5,6 @@ import { ModelsProvider } from "@/hooks/agent/use-models"
 import { getModels } from "@/lib/actions/api-keys"
 import { isAuthConfigured } from "@/lib/server/auth"
 import { getCurrentViewer } from "@/lib/server/auth-session"
-import {
-  getModelSelectorModels,
-  resolveDefaultModelSelectorModel,
-} from "@/lib/shared"
 
 export const dynamic = "force-dynamic"
 
@@ -24,19 +20,10 @@ export default async function Home() {
   }
 
   const availableModels = getModels()
-  const modelSelectorModels = getModelSelectorModels(availableModels)
-
-  const resolvedInitialSelectedModel =
-    modelSelectorModels.length > 0
-      ? resolveDefaultModelSelectorModel(modelSelectorModels)
-      : null
 
   return (
     <ModelsProvider models={availableModels}>
-      <HomePageContent
-        initialSelectedModel={resolvedInitialSelectedModel}
-        viewer={viewer}
-      />
+      <HomePageContent viewer={viewer} />
     </ModelsProvider>
   )
 }

src/app/api/agent/follow-ups/route.ts

@@ -41,7 +41,8 @@ function createEmptyFollowUpResponse(requestId: string) {
 }
 
 function isAvailableModel(model: ModelType): boolean {
-  return getModels().some((availableModel) => availableModel.id === model)
+  const availableIds = new Set<string>(getModels().map((m) => m.id))
+  return availableIds.has(model)
 }
 
 export async function POST(request: NextRequest) {

src/app/api/agent/route.ts

@@ -109,7 +109,7 @@ export async function POST(request: NextRequest) {
     const requestNow = new Date()
     const userTimeZone = resolveUserTimeZone(request)
     const featureFlags = await resolveAgentFeatureFlags()
-    const promptProvider = resolvePromptProvider(selectedModel)
+    const promptProvider = resolvePromptProvider()
     const systemInstruction = buildAgentSystemInstruction(
       {
         id: session.user.id,

src/components/agent/home/home-content.tsx

@@ -51,13 +51,7 @@ const Messages = dynamic(
   }
 )
 
-export function HomePageContent({
-  initialSelectedModel,
-  viewer,
-}: {
-  initialSelectedModel?: ModelType | null
-  viewer: AuthViewer
-}) {
+export function HomePageContent({ viewer }: { viewer: AuthViewer }) {
   const [isPending, startTransition] = useTransition()
   const [isFallbackEnteringConversation, setIsFallbackEnteringConversation] =
     useState(false)
@@ -375,7 +369,6 @@ export function HomePageContent({
                 onStopStream={handleStopStream}
                 isStreaming={streamingState}
                 dismissKeyboardOnSubmit={isMobile}
-                initialSelectedModel={initialSelectedModel}
                 transition={{ isPending, startTransition }}
                 viewTransitionName={promptViewTransitionName}
               />
@@ -426,7 +419,6 @@ export function HomePageContent({
                   onClearQueuedMessage={clearQueuedSubmission}
                   isStreaming={streamingState}
                   dismissKeyboardOnSubmit={isMobile}
-                  initialSelectedModel={initialSelectedModel}
                   transition={{ isPending, startTransition }}
                   viewTransitionName={promptViewTransitionName}
                 />

src/components/agent/messages/user-message.tsx

@@ -1,23 +1,14 @@
 import { Check, Copy, CornerRightUp, Loader2, X } from "lucide-react"
-import { useCallback, useEffect, useMemo, useRef, useState } from "react"
+import { useCallback, useEffect, useRef, useState } from "react"
 import { toast } from "sonner"
 
-import { useModels } from "@/hooks/agent/use-models"
 import { useCopyToClipboard } from "@/hooks/use-copy-to-clipboard"
-import {
-  getModelSelectorModels,
-  isModelSelectorModel,
-  isModelType,
-  type Message,
-  type ModelType,
-  resolveDefaultModelSelectorModel,
-} from "@/lib/shared"
+import { DEFAULT_MODEL, type Message, type ModelType } from "@/lib/shared"
 import { cn } from "@/lib/utils"
 
 import { Button } from "../../ui/button"
 import { Textarea } from "../../ui/textarea"
 import { Tooltip, TooltipContent, TooltipTrigger } from "../../ui/tooltip"
-import { ModelSelector } from "../prompt-form/model-selector"
 import {
   agentShellFrameClass,
   agentShellHighlightClass,
@@ -45,30 +36,8 @@ export function UserMessage({
     newModel: ModelType
   }) => Promise<void> | void
 }) {
-  const { data: availableModels } = useModels()
-  const modelSelectorModels = useMemo(
-    () => getModelSelectorModels(availableModels),
-    [availableModels]
-  )
-  const initialModel = useMemo(() => {
-    const selectedModel = message.metadata?.selectedModel
-    if (isModelType(selectedModel) && isModelSelectorModel(selectedModel)) {
-      return selectedModel
-    }
-
-    if (
-      isModelType(message.llmModel) &&
-      isModelSelectorModel(message.llmModel)
-    ) {
-      return message.llmModel
-    }
-
-    return resolveDefaultModelSelectorModel(modelSelectorModels)
-  }, [message.llmModel, message.metadata?.selectedModel, modelSelectorModels])
-
   const [isEditing, setIsEditing] = useState(false)
   const [editValue, setEditValue] = useState(message.content)
-  const [selectedModel, setSelectedModel] = useState<ModelType>(initialModel)
   const [isEditPending, setIsEditPending] = useState(false)
   const messageContentRef = useRef<HTMLDivElement>(null)
   const textareaRef = useRef<HTMLTextAreaElement>(null)
@@ -93,23 +62,15 @@ export function UserMessage({
     }
   }, [isEditing])
 
-  const handleSelectModel = useCallback((model: ModelType | null) => {
-    if (model) {
-      setSelectedModel(model)
-    }
-  }, [])
-
   const handleStartEditing = useCallback(() => {
     setEditValue(message.content)
-    setSelectedModel(initialModel)
     setIsEditing(true)
-  }, [initialModel, message.content])
+  }, [message.content])
 
   const handleStopEditing = useCallback(() => {
     setIsEditing(false)
     setEditValue(message.content)
-    setSelectedModel(initialModel)
-  }, [message.content, initialModel])
+  }, [message.content])
 
   const handleSubmit = useCallback(async () => {
     const trimmedValue = editValue.trim()
@@ -129,7 +90,7 @@ export function UserMessage({
       await onEditMessage({
         messageId: message.id,
         newContent: trimmedValue,
-        newModel: selectedModel,
+        newModel: DEFAULT_MODEL,
       })
       setIsEditing(false)
     } catch (error) {
@@ -139,7 +100,7 @@ export function UserMessage({
     } finally {
       setIsEditPending(false)
     }
-  }, [editValue, handleStopEditing, message.id, onEditMessage, selectedModel])
+  }, [editValue, handleStopEditing, message.id, onEditMessage])
 
   const onKeyDown = useCallback(
     (e: React.KeyboardEvent<HTMLTextAreaElement>) => {
@@ -221,24 +182,15 @@ export function UserMessage({
               onKeyDown={onKeyDown}
             />
 
-            <div className="grid grid-cols-2 items-center px-2 py-2">
-              <div className="flex min-w-0 items-center justify-start gap-1">
-                <ModelSelector
-                  selectedModel={selectedModel}
-                  handleSelectModel={handleSelectModel}
-                />
-              </div>
-
+            <div className="flex items-center justify-end px-2 py-2">
               <div className="flex min-w-0 items-center justify-end gap-[8px]">
                 <Button
                   onClick={() => {
                     void handleSubmit()
                   }}
                   size="iconSm"
                   variant="default"
-                  disabled={
-                    !editValue.trim() || isEditPending || !selectedModel
-                  }
+                  disabled={!editValue.trim() || isEditPending}
                   className="shrink-0 ring-offset-background"
                 >
                   {isEditPending ? (