diff --git a/CHANGELOG.md b/CHANGELOG.md
index 84bc89dd824..a102ba5c1ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,6 +20,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Exec/YOLO: stop rejecting gateway-host exec in `security=full` plus `ask=off` mode via the Python/Node script preflight hardening path, so promptless YOLO exec once again runs direct interpreter stdin and heredoc forms such as `node <<'NODE' ... NODE`.
+- OpenAI Codex: normalize legacy `openai-completions` transport overrides on default OpenAI/Codex hosts back to the native Codex Responses transport while leaving custom proxies untouched. (#45304) Thanks @dyss1992.
 - Anthropic/plugins: scope Anthropic `api: "anthropic-messages"` defaulting to Anthropic-owned providers, so `openai-codex` and other providers without an explicit `api` no longer get rewritten to the wrong transport. Fixes #64534.
 - fix(qqbot): add SSRF guard to direct-upload URL paths in uploadC2CMedia and uploadGroupMedia [AI-assisted]. (#69595) Thanks @pgondhi987.
 - fix(gateway): enforce allowRequestSessionKey gate on template-rendered mapping sessionKeys. (#69381) Thanks @pgondhi987.
diff --git a/extensions/openai/openai-codex-provider.test.ts b/extensions/openai/openai-codex-provider.test.ts
index 0059fb958f4..39ba10134a9 100644
--- a/extensions/openai/openai-codex-provider.test.ts
+++ b/extensions/openai/openai-codex-provider.test.ts
@@ -495,6 +495,32 @@ describe("openai codex provider", () => {
     });
   });
 
+  it("normalizes legacy completions metadata to the codex transport", () => {
+    const provider = buildOpenAICodexProviderPlugin();
+
+    const model = provider.normalizeResolvedModel?.({
+      provider: "openai-codex",
+      model: {
+        id: "gpt-5.4",
+        name: "gpt-5.4",
+        provider: "openai-codex",
+        api: "openai-completions",
+        baseUrl: "https://api.openai.com/v1",
+        reasoning: true,
+        input: ["text", "image"],
+        cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+        contextWindow: 1_050_000,
+        contextTokens: 272_000,
+        maxTokens: 128_000,
+      },
+    } as never);
+
+    expect(model).toMatchObject({
+      api: "openai-codex-responses",
+      baseUrl: "https://chatgpt.com/backend-api/codex",
+    });
+  });
+
   it("normalizes transport metadata for stale /backend-api/v1 codex routes", () => {
     const provider = buildOpenAICodexProviderPlugin();
 
@@ -509,4 +535,31 @@ describe("openai codex provider", () => {
       baseUrl: "https://chatgpt.com/backend-api/codex",
     });
   });
+
+  it("normalizes transport metadata for legacy completions codex routes", () => {
+    const provider = buildOpenAICodexProviderPlugin();
+
+    expect(
+      provider.normalizeTransport?.({
+        provider: "openai-codex",
+        api: "openai-completions",
+        baseUrl: "https://api.openai.com/v1",
+      } as never),
+    ).toEqual({
+      api: "openai-codex-responses",
+      baseUrl: "https://chatgpt.com/backend-api/codex",
+    });
+  });
+
+  it("leaves custom proxy completions transport metadata unchanged", () => {
+    const provider = buildOpenAICodexProviderPlugin();
+
+    expect(
+      provider.normalizeTransport?.({
+        provider: "openai-codex",
+        api: "openai-completions",
+        baseUrl: "https://proxy.example.com/v1",
+      } as never),
+    ).toBeUndefined();
+  });
 });
diff --git a/extensions/openai/openai-codex-provider.ts b/extensions/openai/openai-codex-provider.ts
index 87630295e11..f37a9a8963d 100644
--- a/extensions/openai/openai-codex-provider.ts
+++ b/extensions/openai/openai-codex-provider.ts
@@ -106,7 +106,8 @@ function normalizeCodexTransportFields(params: {
   const useCodexTransport =
     !params.baseUrl || isOpenAIApiBaseUrl(params.baseUrl) || isOpenAICodexBaseUrl(params.baseUrl);
   const api =
-    useCodexTransport && (!params.api || params.api === "openai-responses")
+    useCodexTransport &&
+    (!params.api || params.api === "openai-responses" || params.api === "openai-completions")
       ? "openai-codex-responses"
       : (params.api ?? undefined);
   const baseUrl =