diff --git a/codex-cli/src/utils/agent/agent-loop.ts b/codex-cli/src/utils/agent/agent-loop.ts
index 5cd1d7b4..97fc4edc 100644
--- a/codex-cli/src/utils/agent/agent-loop.ts
+++ b/codex-cli/src/utils/agent/agent-loop.ts
@@ -488,7 +488,7 @@ export class AgentLoop {
               reasoning = { effort: "high" };
               if (this.model === "o3-mini" || this.model === "o4-mini") {
                 // @ts-expect-error waiting for API type update
-                reasoning.summary = "detailed";
+                reasoning.summary = "auto";
               }
             }
             const mergedInstructions = [prefix, this.instructions]