diff --git a/packages/ai/src/agents/think-and-prep-agent/think-and-prep-agent.ts b/packages/ai/src/agents/think-and-prep-agent/think-and-prep-agent.ts
index 8d8a8c6d2..52c9f0bc3 100644
--- a/packages/ai/src/agents/think-and-prep-agent/think-and-prep-agent.ts
+++ b/packages/ai/src/agents/think-and-prep-agent/think-and-prep-agent.ts
@@ -16,6 +16,10 @@ const DEFAULT_OPTIONS = {
     anthropic: {
       disableParallelToolCalls: true,
     },
+    openai: {
+      disableParallelToolCalls: true,
+      reasoningEffort: 'minimal',
+    },
   },
 };