diff --git a/extensions/github-copilot/models.test.ts b/extensions/github-copilot/models.test.ts
index b1b11b2c0dd..93160439706 100644
--- a/extensions/github-copilot/models.test.ts
+++ b/extensions/github-copilot/models.test.ts
@@ -63,6 +63,10 @@ function requireResolvedModel(ctx: ProviderResolveDynamicModelContext) {
 
 describe("github-copilot model defaults", () => {
   describe("getDefaultCopilotModelIds", () => {
+    it("includes claude-opus-4.6", () => {
+      expect(getDefaultCopilotModelIds()).toContain("claude-opus-4.6");
+    });
+
     it("includes claude-sonnet-4.6", () => {
       expect(getDefaultCopilotModelIds()).toContain("claude-sonnet-4.6");
     });
diff --git a/test/helpers/plugins/provider-auth-contract.ts b/test/helpers/plugins/provider-auth-contract.ts
index 46d0503198c..ba3e5638875 100644
--- a/test/helpers/plugins/provider-auth-contract.ts
+++ b/test/helpers/plugins/provider-auth-contract.ts
@@ -366,7 +366,7 @@ export function describeGithubCopilotProviderAuthContract() {
               },
             },
           ],
-          defaultModel: "github-copilot/gpt-4o",
+          defaultModel: "github-copilot/claude-opus-4.6",
         });
       } finally {
         if (previousIsTTYDescriptor) {