From c380e59cb3a5218e01e22cebd18c6582f58e855a Mon Sep 17 00:00:00 2001
From: Siddharth Ganesan <33737564+Sg312@users.noreply.github.com>
Date: Thu, 12 Feb 2026 13:17:45 -0800
Subject: [PATCH] fix(copilot): make default model opus 4.5 (#3209)

* Fix default model

* Fix
---
 apps/sim/app/api/copilot/chat/route.ts    |  4 ++--
 apps/sim/app/api/mcp/copilot/route.ts     |  2 +-
 apps/sim/app/api/v1/copilot/chat/route.ts |  2 +-
 apps/sim/stores/panel/copilot/store.ts    | 14 +++++++-------
 4 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/apps/sim/app/api/copilot/chat/route.ts b/apps/sim/app/api/copilot/chat/route.ts
index 25349e914..500b7e1a6 100644
--- a/apps/sim/app/api/copilot/chat/route.ts
+++ b/apps/sim/app/api/copilot/chat/route.ts
@@ -85,7 +85,7 @@ const ChatMessageSchema = z.object({
   chatId: z.string().optional(),
   workflowId: z.string().optional(),
   workflowName: z.string().optional(),
-  model: z.string().optional().default('claude-opus-4-6'),
+  model: z.string().optional().default('claude-opus-4-5'),
   mode: z.enum(COPILOT_REQUEST_MODES).optional().default('agent'),
   prefetch: z.boolean().optional(),
   createNewChat: z.boolean().optional().default(false),
@@ -238,7 +238,7 @@ export async function POST(req: NextRequest) {
     let currentChat: any = null
     let conversationHistory: any[] = []
     let actualChatId = chatId
-    const selectedModel = model || 'claude-opus-4-6'
+    const selectedModel = model || 'claude-opus-4-5'
 
     if (chatId || createNewChat) {
       const chatResult = await resolveOrCreateChat({
diff --git a/apps/sim/app/api/mcp/copilot/route.ts b/apps/sim/app/api/mcp/copilot/route.ts
index 5fcce8563..643b339f9 100644
--- a/apps/sim/app/api/mcp/copilot/route.ts
+++ b/apps/sim/app/api/mcp/copilot/route.ts
@@ -38,7 +38,7 @@ import {
 
 const logger = createLogger('CopilotMcpAPI')
 const mcpRateLimiter = new RateLimiter()
-const DEFAULT_COPILOT_MODEL = 'claude-opus-4-6'
+const DEFAULT_COPILOT_MODEL = 'claude-opus-4-5'
 
 export const dynamic = 'force-dynamic'
 export const runtime = 'nodejs'
diff --git a/apps/sim/app/api/v1/copilot/chat/route.ts b/apps/sim/app/api/v1/copilot/chat/route.ts
index 9a71ee54b..6a3817385 100644
--- a/apps/sim/app/api/v1/copilot/chat/route.ts
+++ b/apps/sim/app/api/v1/copilot/chat/route.ts
@@ -8,7 +8,7 @@ import { resolveWorkflowIdForUser } from '@/lib/workflows/utils'
 import { authenticateV1Request } from '@/app/api/v1/auth'
 
 const logger = createLogger('CopilotHeadlessAPI')
-const DEFAULT_COPILOT_MODEL = 'claude-opus-4-6'
+const DEFAULT_COPILOT_MODEL = 'claude-opus-4-5'
 
 const RequestSchema = z.object({
   message: z.string().min(1, 'message is required'),
diff --git a/apps/sim/stores/panel/copilot/store.ts b/apps/sim/stores/panel/copilot/store.ts
index 44f17df10..bd4dd76e2 100644
--- a/apps/sim/stores/panel/copilot/store.ts
+++ b/apps/sim/stores/panel/copilot/store.ts
@@ -1042,7 +1042,7 @@ const cachedAutoAllowedTools = readAutoAllowedToolsFromStorage()
 // Initial state (subset required for UI/streaming)
 const initialState = {
   mode: 'build' as const,
-  selectedModel: 'anthropic/claude-opus-4-6' as CopilotStore['selectedModel'],
+  selectedModel: 'anthropic/claude-opus-4-5' as CopilotStore['selectedModel'],
   agentPrefetch: false,
   availableModels: [] as AvailableModel[],
   isLoadingModels: false,
@@ -2381,17 +2381,17 @@ export const useCopilotStore = create<CopilotStore>()(
           (model) => model.id === normalizedSelectedModel
         )
 
-        // Pick the best default: prefer claude-opus-4-6 with provider priority:
+        // Pick the best default: prefer claude-opus-4-5 with provider priority:
         // direct anthropic > bedrock > azure-anthropic > any other.
         let nextSelectedModel = normalizedSelectedModel
         if (!selectedModelExists && normalizedModels.length > 0) {
-          let opus46: AvailableModel | undefined
+          let opus45: AvailableModel | undefined
           for (const prov of MODEL_PROVIDER_PRIORITY) {
-            opus46 = normalizedModels.find((m) => m.id === `${prov}/claude-opus-4-6`)
-            if (opus46) break
+            opus45 = normalizedModels.find((m) => m.id === `${prov}/claude-opus-4-5`)
+            if (opus45) break
           }
-          if (!opus46) opus46 = normalizedModels.find((m) => m.id.endsWith('/claude-opus-4-6'))
-          nextSelectedModel = opus46 ? opus46.id : normalizedModels[0].id
+          if (!opus45) opus45 = normalizedModels.find((m) => m.id.endsWith('/claude-opus-4-5'))
+          nextSelectedModel = opus45 ? opus45.id : normalizedModels[0].id
         }
 
         set({