diff --git a/.env.example b/.env.example
index e27645a012..9979052ab9 100644
--- a/.env.example
+++ b/.env.example
@@ -404,7 +404,7 @@ QODER_OAUTH_CLIENT_SECRET=4Z3YjXycVsQvyGF1etiNlIBB4RsqSDtW
 # Update these when providers release new CLI versions to avoid blocks.
 
 CLAUDE_USER_AGENT=claude-cli/1.0.83 (external, cli)
-CODEX_USER_AGENT=codex-cli/0.92.0 (Windows 10.0.26100; x64)
+CODEX_USER_AGENT=codex-cli/0.125.0 (Windows 10.0.26100; x64)
 GITHUB_USER_AGENT=GitHubCopilotChat/0.26.7
 ANTIGRAVITY_USER_AGENT=antigravity/1.104.0 darwin/arm64
 KIRO_USER_AGENT=AWS-SDK-JS/3.0.0 kiro-ide/1.0.0
diff --git a/open-sse/config/codexClient.ts b/open-sse/config/codexClient.ts
index df2423cce9..25db6b1930 100644
--- a/open-sse/config/codexClient.ts
+++ b/open-sse/config/codexClient.ts
@@ -1,4 +1,4 @@
-const DEFAULT_CODEX_CLIENT_VERSION = "0.124.0";
+const DEFAULT_CODEX_CLIENT_VERSION = "0.125.0";
 const DEFAULT_CODEX_USER_AGENT_PLATFORM = "Windows 10.0.26100";
 const DEFAULT_CODEX_USER_AGENT_ARCH = "x64";
 const CODEX_VERSION_OVERRIDE_ENV = "CODEX_CLIENT_VERSION";
diff --git a/open-sse/config/providerRegistry.ts b/open-sse/config/providerRegistry.ts
index efb4174f06..657afa57e9 100644
--- a/open-sse/config/providerRegistry.ts
+++ b/open-sse/config/providerRegistry.ts
@@ -482,9 +482,9 @@ export const REGISTRY: Record<string, RegistryEntry> = {
     models: [
       { id: "codex-auto-review", name: "Codex Auto Review", targetFormat: "openai-responses" },
       { id: "gpt-5.5", name: "GPT 5.5", targetFormat: "openai-responses" },
+      { id: "gpt-5.5-mini", name: "GPT 5.5 Mini", targetFormat: "openai-responses" },
       { id: "gpt-5.4", name: "GPT 5.4", targetFormat: "openai-responses" },
       { id: "gpt-5.4-mini", name: "GPT 5.4 Mini", targetFormat: "openai-responses" },
-      { id: "gpt-5.5", name: "GPT 5.5", targetFormat: "openai-responses" },
       { id: "gpt-5.3-codex", name: "GPT 5.3 Codex" },
       { id: "gpt-5.3-codex-xhigh", name: "GPT 5.3 Codex (xHigh)" },
       { id: "gpt-5.3-codex-high", name: "GPT 5.3 Codex (High)" },
diff --git a/tests/unit/executor-codex.test.ts b/tests/unit/executor-codex.test.ts
index f125b28ab1..e8797518dd 100644
--- a/tests/unit/executor-codex.test.ts
+++ b/tests/unit/executor-codex.test.ts
@@ -101,8 +101,8 @@ test("CodexExecutor.buildHeaders binds workspace ids and disables SSE accept for
   assert.equal(standardHeaders.Authorization, "Bearer codex-token");
   assert.equal(standardHeaders.Accept, "text/event-stream");
   assert.equal(standardHeaders["chatgpt-account-id"], "workspace-1");
-  assert.equal(standardHeaders.Version, "0.124.0");
-  assert.equal(standardHeaders["User-Agent"], "codex-cli/0.124.0 (Windows 10.0.26100; x64)");
+  assert.equal(standardHeaders.Version, "0.125.0");
+  assert.equal(standardHeaders["User-Agent"], "codex-cli/0.125.0 (Windows 10.0.26100; x64)");
   assert.equal(compactHeaders.Accept, "application/json");
 });
 
@@ -128,7 +128,7 @@ test("CodexExecutor.buildHeaders honors safe env overrides for Version and User-
     },
     () => {
       const headers = executor.buildHeaders({ accessToken: "codex-token" }, true);
-      assert.equal(headers.Version, "0.124.0");
+      assert.equal(headers.Version, "0.125.0");
       assert.equal(headers["User-Agent"], "custom-codex/9.9.9");
     }
   );
diff --git a/tests/unit/plan3-p0.test.ts b/tests/unit/plan3-p0.test.ts
index 5cba2ea3ff..0446fc426c 100644
--- a/tests/unit/plan3-p0.test.ts
+++ b/tests/unit/plan3-p0.test.ts
@@ -55,6 +55,12 @@ test("getModelInfoCore resolves explicit gpt-5.5 Codex model", async () => {
   assert.equal(info.model, "gpt-5.5");
 });
 
+test("getModelInfoCore resolves gpt-5.5 to codex", async () => {
+  const info = await getModelInfoCore("gpt-5.5", {});
+  assert.equal(info.provider, "codex");
+  assert.equal(info.model, "gpt-5.5");
+});
+
 test("getModelInfoCore returns explicit ambiguity metadata for ambiguous unprefixed model", async () => {
   const info = await getModelInfoCore("claude-haiku-4.5", {});
   assert.equal(info.provider, null);
diff --git a/tests/unit/t12-pricing-updates.test.ts b/tests/unit/t12-pricing-updates.test.ts
index 8437bf3e26..34ee601385 100644
--- a/tests/unit/t12-pricing-updates.test.ts
+++ b/tests/unit/t12-pricing-updates.test.ts
@@ -29,6 +29,12 @@ test("T12: pricing table includes MiniMax, GLM, Kimi and gpt-5.4 mini entries",
   assert.ok(pricing.kimi["kimi-for-coding"], "missing kimi/kimi-for-coding");
 });
 
+test("T12: codex catalog includes GPT 5.5 entries", () => {
+  const codexModels = REGISTRY.codex.models.map((m) => m.id);
+  assert.ok(codexModels.includes("gpt-5.5"), "missing codex/gpt-5.5");
+  assert.ok(codexModels.includes("gpt-5.5-mini"), "missing codex/gpt-5.5-mini");
+});
+
 test("T12: minimax default model list starts with M2.7", () => {
   const minimaxModels = REGISTRY.minimax.models.map((m) => m.id);
   const minimaxCnModels = REGISTRY["minimax-cn"].models.map((m) => m.id);
diff --git a/tests/unit/t20-t22-provider-headers.test.ts b/tests/unit/t20-t22-provider-headers.test.ts
index e3fd82bfb9..bf33bbe589 100644
--- a/tests/unit/t20-t22-provider-headers.test.ts
+++ b/tests/unit/t20-t22-provider-headers.test.ts
@@ -57,8 +57,8 @@ test("T22: github config exposes dedicated responses endpoint", () => {
 
 test("T20: codex config advertises current client headers and auto-review model", () => {
   const codex = REGISTRY.codex;
-  assert.equal(codex.headers.Version, "0.124.0");
+  assert.equal(codex.headers.Version, "0.125.0");
   assert.equal(codex.headers["Openai-Beta"], "responses=experimental");
-  assert.equal(codex.headers["User-Agent"], "codex-cli/0.124.0 (Windows 10.0.26100; x64)");
+  assert.equal(codex.headers["User-Agent"], "codex-cli/0.125.0 (Windows 10.0.26100; x64)");
   assert.ok(codex.models.some((model) => model.id === "codex-auto-review"));
 });