diff --git a/src/plugin-sdk/test-helpers/provider-runtime-contract.ts b/src/plugin-sdk/test-helpers/provider-runtime-contract.ts
index c0d8f2d52bf..fd812a97561 100644
--- a/src/plugin-sdk/test-helpers/provider-runtime-contract.ts
+++ b/src/plugin-sdk/test-helpers/provider-runtime-contract.ts
@@ -605,7 +605,7 @@ export function describeOpenAIProviderRuntimeContract(load: ProviderRuntimeContr
       });
     });
 
-    it("owns forward-compat codex mini models", () => {
+    it("does not claim unsupported codex mini models", () => {
       const provider = requireProviderContractProvider("openai-codex");
       const model = provider.resolveDynamicModel?.({
         provider: "openai-codex",
@@ -623,13 +623,7 @@ export function describeOpenAIProviderRuntimeContract(load: ProviderRuntimeContr
         } as never,
       });
 
-      expect(model).toMatchObject({
-        id: "gpt-5.4-mini",
-        provider: "openai-codex",
-        api: "openai-codex-responses",
-        contextWindow: 272_000,
-        maxTokens: 128_000,
-      });
+      expect(model).toBeUndefined();
     });
 
     it("owns codex transport defaults", () => {
diff --git a/src/plugins/provider-runtime.test-support.ts b/src/plugins/provider-runtime.test-support.ts
index d327cbd438a..5ce2e175654 100644
--- a/src/plugins/provider-runtime.test-support.ts
+++ b/src/plugins/provider-runtime.test-support.ts
@@ -15,7 +15,6 @@ export const expectedAugmentedOpenaiCodexCatalogEntries = [
   { provider: "openai", id: "gpt-5.4-nano", name: "gpt-5.4-nano" },
   { provider: "openai-codex", id: "gpt-5.4", name: "gpt-5.4" },
   { provider: "openai-codex", id: "gpt-5.4-pro", name: "gpt-5.4-pro" },
-  { provider: "openai-codex", id: "gpt-5.4-mini", name: "gpt-5.4-mini" },
 ];
 
 export const expectedAugmentedOpenaiCodexCatalogEntriesWithGpt55 = [