diff --git a/docs/help/testing.md b/docs/help/testing.md
index 7beaf6fc00c..0e8fcb7bfca 100644
--- a/docs/help/testing.md
+++ b/docs/help/testing.md
@@ -248,7 +248,7 @@ gh workflow run package-acceptance.yml --ref main \
   - Use `--platform macos`, `--platform windows`, or `--platform linux` while
     iterating on one guest. Use `--json` for the summary artifact path and
     per-lane status.
-  - The OpenAI lane uses `openai/gpt-5.5` for the live agent-turn proof by
+  - The OpenAI lane uses `openai/gpt-5.4` for the live agent-turn proof by
     default. Pass `--model <provider/model>` or set
     `OPENCLAW_PARALLELS_OPENAI_MODEL` when deliberately validating another
     OpenAI model.
diff --git a/scripts/e2e/parallels/provider-auth.ts b/scripts/e2e/parallels/provider-auth.ts
index 872029b80bc..49796d8fc97 100644
--- a/scripts/e2e/parallels/provider-auth.ts
+++ b/scripts/e2e/parallels/provider-auth.ts
@@ -42,7 +42,7 @@ export function resolveProviderAuth(input: {
       apiKeyEnv: input.apiKeyEnv || "OPENAI_API_KEY",
       authChoice: "openai-api-key",
       authKeyFlag: "openai-api-key",
-      modelId: input.modelId || process.env.OPENCLAW_PARALLELS_OPENAI_MODEL || "openai/gpt-5.5",
+      modelId: input.modelId || process.env.OPENCLAW_PARALLELS_OPENAI_MODEL || "openai/gpt-5.4",
     },
   };
   const resolved = providerDefaults[input.provider];
diff --git a/test/scripts/parallels-smoke-model.test.ts b/test/scripts/parallels-smoke-model.test.ts
index b449d74bf6f..22f5066ed7d 100644
--- a/test/scripts/parallels-smoke-model.test.ts
+++ b/test/scripts/parallels-smoke-model.test.ts
@@ -88,7 +88,7 @@ describe("Parallels smoke model selection", () => {
 
     expect(providerAuth).toContain("OPENCLAW_PARALLELS_OPENAI_MODEL");
     expect(providerAuth).toContain("OPENCLAW_PARALLELS_WINDOWS_OPENAI_MODEL");
-    expect(providerAuth).toContain("openai/gpt-5.5");
+    expect(providerAuth).toContain("openai/gpt-5.4");
     expect(providerAuth).toContain("openai/gpt-4.1-mini");
     expect(providerAuth).toContain('authChoice: "openai-api-key"');
     expect(providerAuth).toContain('authChoice: "apiKey"');
@@ -227,7 +227,7 @@ console.log(resolveUbuntuVmName("Ubuntu missing"));
       apiKeyValue: "sk-openai",
       authChoice: "openai-api-key",
       authKeyFlag: "openai-api-key",
-      modelId: "openai/gpt-5.5",
+      modelId: "openai/gpt-5.4",
     });
 
     expect(