diff --git a/src/cron/isolated-agent/run.fast-mode.test.ts b/src/cron/isolated-agent/run.fast-mode.test.ts
index cf9a22c9a6f..f37376b9069 100644
--- a/src/cron/isolated-agent/run.fast-mode.test.ts
+++ b/src/cron/isolated-agent/run.fast-mode.test.ts
@@ -16,6 +16,7 @@ import {
 const runCronIsolatedAgentTurn = await loadRunCronIsolatedAgentTurn();
 
 const OPENAI_GPT4_MODEL = "openai/gpt-4";
+const EXPECTED_OPENAI_MODEL = "gpt-5.4";
 
 function mockSuccessfulModelFallback() {
   runWithModelFallbackMock.mockImplementation(async ({ provider, model, run }) => {
@@ -89,7 +90,7 @@ async function runFastModeCase(params: {
   expect(runEmbeddedPiAgentMock).toHaveBeenCalledOnce();
   expect(runEmbeddedPiAgentMock.mock.calls[0][0]).toMatchObject({
     provider: "openai",
-    model: "gpt-4",
+    model: EXPECTED_OPENAI_MODEL,
     fastMode: params.expectedFastMode,
     allowGatewaySubagentBinding: true,
   });
diff --git a/src/cron/isolated-agent/run.skill-filter.test.ts b/src/cron/isolated-agent/run.skill-filter.test.ts
index 2e024352f09..7be58645924 100644
--- a/src/cron/isolated-agent/run.skill-filter.test.ts
+++ b/src/cron/isolated-agent/run.skill-filter.test.ts
@@ -353,7 +353,7 @@ describe("runCronIsolatedAgentTurn — skill filter", () => {
 
       expect(result.status).toBe("ok");
       expect(session.sessionEntry.contextTokens).toBe(512_000);
-      expect(lookupContextTokensMock).toHaveBeenCalledWith("gpt-4", {
+      expect(lookupContextTokensMock).toHaveBeenCalledWith("gpt-5.4", {
         allowAsyncLoad: false,
       });
     });