diff --git a/lib/chat/toolChains/getPrepareStepResult.ts b/lib/chat/toolChains/getPrepareStepResult.ts
index 02dd8e71..4362ea48 100644
--- a/lib/chat/toolChains/getPrepareStepResult.ts
+++ b/lib/chat/toolChains/getPrepareStepResult.ts
@@ -57,7 +57,6 @@ const getPrepareStepResult = (options: PrepareStepOptions): PrepareStepResult |
         result.messages = options.messages.concat(nextToolItem.messages);
       }
 
-      // Add model if specified for this tool
       const model = TOOL_MODEL_MAP[nextToolItem.toolName];
       if (model) {
         result.model = model;
diff --git a/lib/chat/toolChains/toolChains.ts b/lib/chat/toolChains/toolChains.ts
index 1275199d..98f2c6f7 100644
--- a/lib/chat/toolChains/toolChains.ts
+++ b/lib/chat/toolChains/toolChains.ts
@@ -15,11 +15,25 @@ export type PrepareStepResult = {
   messages?: ModelMessage[];
 };
 
-// Map specific tools to their required models
+// Forced toolChoice is incompatible with Anthropic extended thinking.
+// Every tool used in a chain must have a model here to avoid the conflict.
 export const TOOL_MODEL_MAP: Record<string, LanguageModel> = {
   update_account_info: "gemini-2.5-pro",
-  // Add other tools that need specific models here
-  // e.g., create_segments: "gpt-4-turbo",
+  get_spotify_search: "openai/gpt-5.4-mini",
+  update_artist_socials: "openai/gpt-5.4-mini",
+  artist_deep_research: "openai/gpt-5.4-mini",
+  spotify_deep_research: "openai/gpt-5.4-mini",
+  get_artist_socials: "openai/gpt-5.4-mini",
+  get_spotify_artist_top_tracks: "openai/gpt-5.4-mini",
+  get_spotify_artist_albums: "openai/gpt-5.4-mini",
+  get_spotify_album: "openai/gpt-5.4-mini",
+  search_web: "openai/gpt-5.4-mini",
+  generate_txt_file: "openai/gpt-5.4-mini",
+  create_segments: "openai/gpt-5.4-mini",
+  youtube_login: "openai/gpt-5.4-mini",
+  web_deep_research: "openai/gpt-5.4-mini",
+  create_knowledge_base: "openai/gpt-5.4-mini",
+  send_email: "openai/gpt-5.4-mini",
 };
 
 // Map trigger tool -> sequence AFTER trigger