diff --git a/packages/opencode/src/session/system.ts b/packages/opencode/src/session/system.ts
index fff90808864..db85089438b 100644
--- a/packages/opencode/src/session/system.ts
+++ b/packages/opencode/src/session/system.ts
@@ -29,11 +29,11 @@ export namespace SystemPrompt {
   }
 
   export function provider(model: Provider.Model) {
+    if (model.providerID.includes("anthropic") && model.api.id.includes("claude")) return []
     if (model.api.id.includes("gpt-5")) return [PROMPT_CODEX]
     if (model.api.id.includes("gpt-") || model.api.id.includes("o1") || model.api.id.includes("o3"))
       return [PROMPT_BEAST]
     if (model.api.id.includes("gemini-")) return [PROMPT_GEMINI]
-    if (model.api.id.includes("claude")) return [PROMPT_ANTHROPIC]
     return [PROMPT_ANTHROPIC_WITHOUT_TODO]
   }