diff --git a/src/agents/model-compat.test.ts b/src/agents/model-compat.test.ts
index 2fd5df0883c..6428e9705d0 100644
--- a/src/agents/model-compat.test.ts
+++ b/src/agents/model-compat.test.ts
@@ -307,7 +307,7 @@ describe("resolveForwardCompatModel", () => {
     expect(model?.reasoning).toBe(true);
     expect(model?.contextWindow).toBe(1_050_000);
     expect(model?.maxTokens).toBe(128_000);
-    expect(model?.cost).toEqual({ input: 0, output: 0, cacheRead: 0, cacheWrite: 0 });
+    expect(model?.cost).toEqual({ input: 2.5, output: 15, cacheRead: 0.25, cacheWrite: 0 });
   });
 
   it("resolves openai gpt-5.4-pro via template fallback", () => {
@@ -320,6 +320,7 @@ describe("resolveForwardCompatModel", () => {
     expect(model?.baseUrl).toBe("https://api.openai.com/v1");
     expect(model?.contextWindow).toBe(1_050_000);
     expect(model?.maxTokens).toBe(128_000);
+    expect(model?.cost).toEqual({ input: 30, output: 180, cacheRead: 0, cacheWrite: 0 });
   });
 
   it("resolves openai-codex gpt-5.4 via codex template fallback", () => {