diff --git a/packages/coding-agent/src/core/model-resolver.ts b/packages/coding-agent/src/core/model-resolver.ts
index bd331f690..d1abd57cf 100644
--- a/packages/coding-agent/src/core/model-resolver.ts
+++ b/packages/coding-agent/src/core/model-resolver.ts
@@ -21,7 +21,7 @@ export const defaultModelPerProvider: Partial<Record<KnownProvider, string>> = {
 	"amazon-bedrock": "us.anthropic.claude-opus-4-6-v1",
 	"ant-ling": "Ring-2.6-1T",
 	anthropic: "claude-opus-4-8",
-	openai: "gpt-5.5",
+	openai: "gpt-6.1-sol",
 	azure: "gpt-5.4",
 	"openai-codex": "gpt-6.1-sol",
 	radius: "balanced",
diff --git a/packages/coding-agent/test/model-resolver.test.ts b/packages/coding-agent/test/model-resolver.test.ts
index 018f4c8d1..71cd27f0c 100644
--- a/packages/coding-agent/test/model-resolver.test.ts
+++ b/packages/coding-agent/test/model-resolver.test.ts
@@ -698,7 +698,7 @@ describe("resolveCliModel", () => {
 
 describe("default model selection", () => {
 	test("openai defaults track current models", () => {
-		expect(defaultModelPerProvider.openai).toBe("gpt-5.5");
+		expect(defaultModelPerProvider.openai).toBe("gpt-6.1-sol");
 		expect(defaultModelPerProvider["openai-codex"]).toBe("gpt-6.1-sol");
 	});