fix: OpenAI reasoning/thinking blocks not showing

- Use Responses API instead of Chat Completions API for OpenAI
  (.chat() -> default call) to support reasoning events
- Add o4 to reasoning model detection
- Change default reasoningSummary from 'detailed' to 'auto'
  (not all models support 'detailed')
- Update types to match AI SDK: 'auto' | 'detailed'

app/api/chat/route.ts

@@ -173,12 +173,9 @@ async function handleChatRequest(req: Request): Promise<Response> {
             : undefined
 
     // Extract user input text for Langfuse trace
-    // Find the last USER message, not just the last message (which could be assistant in multi-step tool flows)
+    const lastMessage = messages[messages.length - 1]
-    const lastUserMessage = [...messages]
-        .reverse()
-        .find((m: any) => m.role === "user")
     const userInputText =
-        lastUserMessage?.parts?.find((p: any) => p.type === "text")?.text || ""
+        lastMessage?.parts?.find((p: any) => p.type === "text")?.text || ""
 
     // Update Langfuse trace with input, session, and user
     setTraceInput({
@@ -240,10 +237,9 @@ async function handleChatRequest(req: Request): Promise<Response> {
     // Get the appropriate system prompt based on model (extended for Opus/Haiku 4.5)
     const systemMessage = getSystemPrompt(modelId, minimalStyle)
 
-    // Extract file parts (images) from the last user message
+    // Extract file parts (images) from the last message
     const fileParts =
-        lastUserMessage?.parts?.filter((part: any) => part.type === "file") ||
+        lastMessage.parts?.filter((part: any) => part.type === "file") || []
-        []
 
     // User input only - XML is now in a separate cached system message
     const formattedUserInput = `User input:
@@ -252,7 +248,7 @@ ${userInputText}
 """`
 
     // Convert UIMessages to ModelMessages and add system message
-    const modelMessages = await convertToModelMessages(messages)
+    const modelMessages = convertToModelMessages(messages)
 
     // DEBUG: Log incoming messages structure
     console.log("[route.ts] Incoming messages count:", messages.length)
@@ -690,8 +686,7 @@ Call this tool to get shape names and usage syntax for a specific library.`,
                 // Total input = non-cached + cached (these are separate counts)
                 // Note: cacheWriteInputTokens is not available on finish part
                 const totalInputTokens =
-                    (usage.inputTokens ?? 0) +
+                    (usage.inputTokens ?? 0) + (usage.cachedInputTokens ?? 0)
-                    (usage.inputTokenDetails?.cacheReadTokens ?? 0)
                 return {
                     inputTokens: totalInputTokens,
                     outputTokens: usage.outputTokens ?? 0,

components/chat-panel.tsx

@@ -76,7 +76,6 @@ interface ChatPanelProps {
 const TOOL_ERROR_STATE = "output-error" as const
 const DEBUG = process.env.NODE_ENV === "development"
 const MAX_AUTO_RETRY_COUNT = 1
-const MAX_CONTINUATION_RETRY_COUNT = 2 // Limit for truncation continuation retries
 
 /**
  * Check if auto-resubmit should happen based on tool errors.
@@ -217,8 +216,6 @@ export default function ChatPanel({
 
     // Ref to track consecutive auto-retry count (reset on user action)
     const autoRetryCountRef = useRef(0)
-    // Ref to track continuation retry count (for truncation handling)
-    const continuationRetryCountRef = useRef(0)
 
     // Ref to accumulate partial XML when output is truncated due to maxOutputTokens
     // When partialXmlRef.current.length > 0, we're in continuation mode
@@ -659,25 +656,15 @@ Continue from EXACTLY where you stopped.`,
             if (!shouldRetry) {
                 // No error, reset retry count and clear state
                 autoRetryCountRef.current = 0
-                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
 
-            // Continuation mode: limited retries for truncation handling
+            // Continuation mode: unlimited retries (truncation continuation, not real errors)
+            // Server limits to 5 steps via stepCountIs(5)
             if (isInContinuationMode) {
-                if (
+                // Don't count against retry limit for continuation
-                    continuationRetryCountRef.current >=
+                // Quota checks still apply below
-                    MAX_CONTINUATION_RETRY_COUNT
-                ) {
-                    toast.error(
-                        `Continuation retry limit reached (${MAX_CONTINUATION_RETRY_COUNT}). The diagram may be too complex.`,
-                    )
-                    continuationRetryCountRef.current = 0
-                    partialXmlRef.current = ""
-                    return false
-                }
-                continuationRetryCountRef.current++
             } else {
                 // Regular error: check retry count limit
                 if (autoRetryCountRef.current >= MAX_AUTO_RETRY_COUNT) {
@@ -697,7 +684,6 @@ Continue from EXACTLY where you stopped.`,
             if (!tokenLimitCheck.allowed) {
                 quotaManager.showTokenLimitToast(tokenLimitCheck.used)
                 autoRetryCountRef.current = 0
-                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
@@ -706,7 +692,6 @@ Continue from EXACTLY where you stopped.`,
             if (!tpmCheck.allowed) {
                 quotaManager.showTPMLimitToast()
                 autoRetryCountRef.current = 0
-                continuationRetryCountRef.current = 0
                 partialXmlRef.current = ""
                 return false
             }
@@ -1039,7 +1024,6 @@ Continue from EXACTLY where you stopped.`,
     ) => {
         // Reset all retry/continuation state on user-initiated message
         autoRetryCountRef.current = 0
-        continuationRetryCountRef.current = 0
         partialXmlRef.current = ""
 
         const config = getSelectedAIConfig()

package-lock.json

@@ -9,21 +9,21 @@
             "version": "0.4.6",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/amazon-bedrock": "^4.0.1",
+                "@ai-sdk/amazon-bedrock": "^3.0.70",
-                "@ai-sdk/anthropic": "^3.0.0",
+                "@ai-sdk/anthropic": "^2.0.44",
-                "@ai-sdk/azure": "^3.0.0",
+                "@ai-sdk/azure": "^2.0.69",
-                "@ai-sdk/deepseek": "^2.0.0",
+                "@ai-sdk/deepseek": "^1.0.30",
-                "@ai-sdk/gateway": "^3.0.0",
+                "@ai-sdk/gateway": "^2.0.21",
-                "@ai-sdk/google": "^3.0.0",
+                "@ai-sdk/google": "^2.0.0",
-                "@ai-sdk/openai": "^3.0.0",
+                "@ai-sdk/openai": "^2.0.19",
-                "@ai-sdk/react": "^3.0.1",
+                "@ai-sdk/react": "^2.0.107",
                 "@aws-sdk/credential-providers": "^3.943.0",
                 "@formatjs/intl-localematcher": "^0.7.2",
                 "@langfuse/client": "^4.4.9",
                 "@langfuse/otel": "^4.4.4",
                 "@langfuse/tracing": "^4.4.9",
                 "@next/third-parties": "^16.0.6",
-                "@openrouter/ai-sdk-provider": "^1.5.4",
+                "@openrouter/ai-sdk-provider": "^1.2.3",
                 "@opentelemetry/exporter-trace-otlp-http": "^0.208.0",
                 "@opentelemetry/sdk-trace-node": "^2.2.0",
                 "@radix-ui/react-alert-dialog": "^1.1.15",
@@ -38,7 +38,7 @@
                 "@radix-ui/react-tooltip": "^1.1.8",
                 "@radix-ui/react-use-controllable-state": "^1.2.2",
                 "@xmldom/xmldom": "^0.9.8",
-                "ai": "^6.0.1",
+                "ai": "^5.0.89",
                 "base-64": "^1.0.0",
                 "class-variance-authority": "^0.7.1",
                 "clsx": "^2.1.1",
@@ -93,14 +93,14 @@
             }
         },
         "node_modules/@ai-sdk/amazon-bedrock": {
-            "version": "4.0.1",
+            "version": "3.0.70",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/amazon-bedrock/-/amazon-bedrock-4.0.1.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/amazon-bedrock/-/amazon-bedrock-3.0.70.tgz",
-            "integrity": "sha512-8Qu5wHTHYTwptZ1L4Sv8hvXMyKRNWUD6dH8wm+Zl8RDOEXZJNENS6zec7u/sWJKuvefL7j+xN8z3IVduhGfxig==",
+            "integrity": "sha512-4NIBlwuS/iLKq2ynOqqyJ9imk/oyHuOzhBx88Bfm5I0ihQPKJ0dMMD1IKKuyDZvLRYKmlOEpa//P+/ZBp10drw==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/anthropic": "3.0.0",
+                "@ai-sdk/anthropic": "2.0.56",
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0",
+                "@ai-sdk/provider-utils": "3.0.19",
                 "@smithy/eventstream-codec": "^4.0.1",
                 "@smithy/util-utf8": "^4.0.0",
                 "aws4fetch": "^1.0.20"
@@ -112,14 +112,48 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/anthropic": {
+        "node_modules/@ai-sdk/amazon-bedrock/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.0",
+            "version": "3.0.19",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/anthropic/-/anthropic-3.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
-            "integrity": "sha512-4BnxkXwRkvh+OB1ze0mHbskT90HL4MNrg6JUsRDkIsU9w5vitvGzxwc/XwlByUGMap/5I8/LZ3XZDzv6KViCuQ==",
+            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0"
+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/anthropic": {
+            "version": "2.0.56",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/anthropic/-/anthropic-2.0.56.tgz",
+            "integrity": "sha512-XHJKu0Yvfu9SPzRfsAFESa+9T7f2YJY6TxykKMfRsAwpeWAiX/Gbx5J5uM15AzYC3Rw8tVP3oH+j7jEivENirQ==",
+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "3.0.19"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/anthropic/node_modules/@ai-sdk/provider-utils": {
+            "version": "3.0.19",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
+            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
+            "license": "Apache-2.0",
+            "dependencies": {
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+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
             },
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                 "node": ">=18"
@@ -129,14 +163,31 @@
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         },
         "node_modules/@ai-sdk/azure": {
-            "version": "3.0.0",
+            "version": "2.0.69",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/azure/-/azure-3.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/azure/-/azure-2.0.69.tgz",
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+            "integrity": "sha512-0Y+f0XHviWw9ixB2Dkqyg07V67oczUh8adh4B/t0LgVMVkvOsf/WEzfYx2/LDqdvI/o8IYyJ6JzsCKpBwbS61g==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/openai": "3.0.0",
+                "@ai-sdk/openai": "2.0.67",
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0"
+                "@ai-sdk/provider-utils": "3.0.17"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/azure/node_modules/@ai-sdk/provider-utils": {
+            "version": "3.0.17",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.17.tgz",
+            "integrity": "sha512-TR3Gs4I3Tym4Ll+EPdzRdvo/rc8Js6c4nVhFLuvGLX/Y4V9ZcQMa/HTiYsHEgmYrf1zVi6Q145UEZUfleOwOjw==",
+            "license": "Apache-2.0",
+            "dependencies": {
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+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
             },
             "engines": {
                 "node": ">=18"
@@ -146,13 +197,14 @@
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         },
         "node_modules/@ai-sdk/deepseek": {
-            "version": "2.0.0",
+            "version": "1.0.30",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/deepseek/-/deepseek-2.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/deepseek/-/deepseek-1.0.30.tgz",
-            "integrity": "sha512-qRX06mouHaF4OePE4S8W8+fLX7Iq4dWk7Ul4+SSPBzx6zBJKUqwHYW2XyPShNWhT4Rcogpl5yHJUrBaOExkiyg==",
+            "integrity": "sha512-pafNclW9L8Z3WimaRwlpHrGbdeaDE/UklT3rMi2aoRRyrA+s7zGcFuu1zbO2ViLNlKfaS91XZa9MFAPXbIftUA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/openai-compatible": "1.0.28",
-                "@ai-sdk/provider-utils": "4.0.0"
+                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "3.0.18"
             },
             "engines": {
                 "node": ">=18"
@@ -162,13 +214,13 @@
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         },
         "node_modules/@ai-sdk/gateway": {
-            "version": "3.0.0",
+            "version": "2.0.21",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/gateway/-/gateway-3.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/gateway/-/gateway-2.0.21.tgz",
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+            "integrity": "sha512-BwV7DU/lAm3Xn6iyyvZdWgVxgLu3SNXzl5y57gMvkW4nGhAOV5269IrJzQwGt03bb107sa6H6uJwWxc77zXoGA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0",
+                "@ai-sdk/provider-utils": "3.0.19",
                 "@vercel/oidc": "3.0.5"
             },
             "engines": {
@@ -178,14 +230,15 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/google": {
+        "node_modules/@ai-sdk/gateway/node_modules/@ai-sdk/provider-utils": {
-            "version": "3.0.0",
+            "version": "3.0.19",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/google/-/google-3.0.0.tgz",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.19.tgz",
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+            "integrity": "sha512-W41Wc9/jbUVXVwCN/7bWa4IKe8MtxO3EyA0Hfhx6grnmiYlCvpI8neSYWFE0zScXJkgA/YK3BRybzgyiXuu6JA==",
             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0"
+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
             },
             "engines": {
                 "node": ">=18"
@@ -194,14 +247,90 @@
                 "zod": "^3.25.76 || ^4.1.8"
             }
         },
-        "node_modules/@ai-sdk/openai": {
+        "node_modules/@ai-sdk/google": {
-            "version": "3.0.0",
+            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/openai/-/openai-3.0.0.tgz",
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             "license": "Apache-2.0",
             "dependencies": {
-                "@ai-sdk/provider": "3.0.0",
+                "@ai-sdk/provider": "2.0.0",
-                "@ai-sdk/provider-utils": "4.0.0"
+                "@ai-sdk/provider-utils": "3.0.0"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4"
+            }
+        },
+        "node_modules/@ai-sdk/google/node_modules/@ai-sdk/provider-utils": {
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+            },
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+            },
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+                "zod": "^3.25.76 || ^4.1.8"
+            }
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+        "node_modules/@ai-sdk/openai-compatible": {
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+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@ai-sdk/provider-utils": "3.0.18"
+            },
+            "engines": {
+                "node": ">=18"
+            },
+            "peerDependencies": {
+                "zod": "^3.25.76 || ^4.1.8"
+            }
+        },
+        "node_modules/@ai-sdk/openai/node_modules/@ai-sdk/provider-utils": {
+            "version": "3.0.17",
+            "resolved": "https://registry.npmjs.org/@ai-sdk/provider-utils/-/provider-utils-3.0.17.tgz",
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+            "license": "Apache-2.0",
+            "dependencies": {
+                "@ai-sdk/provider": "2.0.0",
+                "@standard-schema/spec": "^1.0.0",
+                "eventsource-parser": "^3.0.6"
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                 "node": ">=18"
@@ -211,9 +340,9 @@
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         },
         "node_modules/@ai-sdk/provider": {
-            "version": "3.0.0",
+            "version": "2.0.0",
-            "resolved": "https://registry.npmjs.org/@ai-sdk/provider/-/provider-3.0.0.tgz",
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@@ -3901,12 +4036,28 @@
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+                "react-dom": "^18 || ^19"
+            },
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+                "@tanstack/react-query": {
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+                },
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@@ -7017,9 +7168,9 @@
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@@ -8153,6 +8304,23 @@
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@@ -9623,7 +9791,7 @@
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@@ -10288,7 +10456,7 @@
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-            "resolved": "https://registry.npmjs.org/electron-winstaller/-/electron-winstaller-5.4.0.tgz",
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@@ -10310,7 +10478,7 @@
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-            "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz",
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@@ -15901,7 +16040,7 @@
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-            "resolved": "https://registry.npmjs.org/postject/-/postject-1.0.0-alpha.6.tgz",
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@@ -15919,7 +16058,7 @@
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-            "resolved": "https://registry.npmjs.org/commander/-/commander-9.5.0.tgz",
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@@ -17797,7 +17936,7 @@
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-            "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
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@@ -17811,7 +17950,7 @@
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-            "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
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package.json

@@ -24,21 +24,21 @@
         "dist:all": "npm run electron:build && npm run electron:prepare && npx electron-builder --mac --win --linux"
     },
     "dependencies": {
-        "@ai-sdk/amazon-bedrock": "^4.0.1",
+        "@ai-sdk/amazon-bedrock": "^3.0.70",
-        "@ai-sdk/anthropic": "^3.0.0",
+        "@ai-sdk/anthropic": "^2.0.44",
-        "@ai-sdk/azure": "^3.0.0",
+        "@ai-sdk/azure": "^2.0.69",
-        "@ai-sdk/deepseek": "^2.0.0",
+        "@ai-sdk/deepseek": "^1.0.30",
-        "@ai-sdk/gateway": "^3.0.0",
+        "@ai-sdk/gateway": "^2.0.21",
-        "@ai-sdk/google": "^3.0.0",
+        "@ai-sdk/google": "^2.0.0",
-        "@ai-sdk/openai": "^3.0.0",
+        "@ai-sdk/openai": "^2.0.19",
-        "@ai-sdk/react": "^3.0.1",
+        "@ai-sdk/react": "^2.0.107",
         "@aws-sdk/credential-providers": "^3.943.0",
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         "@langfuse/client": "^4.4.9",
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         "@langfuse/tracing": "^4.4.9",
         "@next/third-parties": "^16.0.6",
-        "@openrouter/ai-sdk-provider": "^1.5.4",
+        "@openrouter/ai-sdk-provider": "^1.2.3",
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@@ -53,7 +53,7 @@
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         "@radix-ui/react-use-controllable-state": "^1.2.2",
         "@xmldom/xmldom": "^0.9.8",
-        "ai": "^6.0.1",
+        "ai": "^5.0.89",
         "base-64": "^1.0.0",
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@@ -111,10 +111,5 @@
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-    },
-    "overrides": {
-        "@openrouter/ai-sdk-provider": {
-            "ai": "^6.0.1"
-        }
     }
 }