diff --git a/extensions/codex/src/app-server/run-attempt.ts b/extensions/codex/src/app-server/run-attempt.ts
index 1e684a7141cf..c3f0f2834ba4 100644
--- a/extensions/codex/src/app-server/run-attempt.ts
+++ b/extensions/codex/src/app-server/run-attempt.ts
@@ -3129,7 +3129,9 @@ export async function runCodexAppServerAttempt(
       systemPromptReport,
     };
   } finally {
-    await maybeEmitFastModeAutoResetBestEffort();
+    if (params.isFinalFallbackAttempt !== false) {
+      await maybeEmitFastModeAutoResetBestEffort();
+    }
     codexModelCallDiagnostics.emitError(
       "codex app-server run completed without model-call terminal event",
     );
diff --git a/src/auto-reply/reply/agent-runner-cli-dispatch.ts b/src/auto-reply/reply/agent-runner-cli-dispatch.ts
index ffa03a7476bb..2d177607f2b8 100644
--- a/src/auto-reply/reply/agent-runner-cli-dispatch.ts
+++ b/src/auto-reply/reply/agent-runner-cli-dispatch.ts
@@ -540,7 +540,9 @@ async function runCliAgentWithLifecycleInternal(
     for (const bridge of bridges) {
       bridge.unsubscribe();
     }
-    await maybeEmitFastModeAutoReset();
+    if (params.runParams.isFinalFallbackAttempt !== false) {
+      await maybeEmitFastModeAutoReset();
+    }
     if (emitLifecycleTerminal && !lifecycleTerminalEmitted) {
       emitAgentEvent({
         runId: params.runId,
diff --git a/src/auto-reply/reply/followup-runner.ts b/src/auto-reply/reply/followup-runner.ts
index f1eadfd67536..6d47d53840e9 100644
--- a/src/auto-reply/reply/followup-runner.ts
+++ b/src/auto-reply/reply/followup-runner.ts
@@ -1066,6 +1066,7 @@ export function createFollowupRunner(params: {
                     fastModeStartedAtMs,
                     fastModeAutoOnSeconds: candidateFastMode.fastModeAutoOnSeconds,
                     fastModeAutoProgressState,
+                    isFinalFallbackAttempt: runOptions?.isFinalFallbackAttempt,
                     timeoutMs: run.timeoutMs,
                     runTimeoutOverrideMs: run.runTimeoutOverrideMs,
                     runId,