diff --git a/scripts/e2e/parallels/windows-git.ts b/scripts/e2e/parallels/windows-git.ts
index f78845da836..6dcd2d17266 100644
--- a/scripts/e2e/parallels/windows-git.ts
+++ b/scripts/e2e/parallels/windows-git.ts
@@ -12,21 +12,31 @@ export async function prepareMinGitZip(tgzDir: string): Promise<string> {
       String.raw`import json
 import urllib.request
 
-req = urllib.request.Request(
-    "https://api.github.com/repos/git-for-windows/git/releases/latest",
-    headers={
-        "User-Agent": "openclaw-parallels-smoke",
-        "Accept": "application/vnd.github+json",
-    },
-)
-with urllib.request.urlopen(req, timeout=30) as response:
-    data = json.load(response)
-
-assets = data.get("assets", [])
 preferred_names = [
     "MinGit-2.53.0.2-arm64.zip",
     "MinGit-2.53.0.2-64-bit.zip",
 ]
+fallback_urls = {
+    "MinGit-2.53.0.2-arm64.zip": "https://github.com/git-for-windows/git/releases/download/v2.53.0.windows.2/MinGit-2.53.0.2-arm64.zip",
+    "MinGit-2.53.0.2-64-bit.zip": "https://github.com/git-for-windows/git/releases/download/v2.53.0.windows.2/MinGit-2.53.0.2-64-bit.zip",
+}
+
+try:
+    req = urllib.request.Request(
+        "https://api.github.com/repos/git-for-windows/git/releases/latest",
+        headers={
+            "User-Agent": "openclaw-parallels-smoke",
+            "Accept": "application/vnd.github+json",
+        },
+    )
+    with urllib.request.urlopen(req, timeout=30) as response:
+        data = json.load(response)
+except Exception:
+    print(preferred_names[0])
+    print(fallback_urls[preferred_names[0]])
+    raise SystemExit(0)
+
+assets = data.get("assets", [])
 
 best = None
 for wanted in preferred_names:
diff --git a/src/agents/provider-transport-fetch.test.ts b/src/agents/provider-transport-fetch.test.ts
index 281bf380a3f..d55ccdf011d 100644
--- a/src/agents/provider-transport-fetch.test.ts
+++ b/src/agents/provider-transport-fetch.test.ts
@@ -373,12 +373,12 @@ describe("buildGuardedModelFetch", () => {
     });
     const model = {
       id: "gpt-5.4",
-      provider: "openai",
+      provider: "openrouter",
       api: "openai-responses",
-      baseUrl: "https://api.openai.com/v1",
+      baseUrl: "https://openrouter.ai/api/v1",
     } as unknown as Model<"openai-responses">;
 
-    const response = await buildGuardedModelFetch(model)("https://api.openai.com/v1/responses", {
+    const response = await buildGuardedModelFetch(model)("https://openrouter.ai/api/v1/responses", {
       method: "POST",
     });
     const items = [];
@@ -389,6 +389,30 @@ describe("buildGuardedModelFetch", () => {
     expect(items).toEqual([{ ok: true }]);
   });
 
+  it("leaves official OpenAI SSE streams unmodified", async () => {
+    fetchWithSsrFGuardMock.mockResolvedValue({
+      response: new Response('event: response.created\n\ndata: {"ok": true}\n\n', {
+        headers: { "content-type": "text/event-stream" },
+      }),
+      finalUrl: "https://api.openai.com/v1/responses",
+      release: vi.fn(async () => undefined),
+    });
+    const model = {
+      id: "gpt-5.5",
+      provider: "openai",
+      api: "openai-responses",
+      baseUrl: "https://api.openai.com/v1",
+    } as unknown as Model<"openai-responses">;
+
+    const response = await buildGuardedModelFetch(model)("https://api.openai.com/v1/responses", {
+      method: "POST",
+    });
+
+    await expect(response.text()).resolves.toBe(
+      'event: response.created\n\ndata: {"ok": true}\n\n',
+    );
+  });
+
   it("drops whitespace-only SSE data frames with CRLF delimiters", async () => {
     fetchWithSsrFGuardMock.mockResolvedValue({
       response: new Response('event: message\r\ndata:   \r\n\r\ndata: {"ok": true}\r\n\r\n', {
@@ -399,13 +423,13 @@ describe("buildGuardedModelFetch", () => {
     });
     const model = {
       id: "gpt-5.4",
-      provider: "openai",
+      provider: "openrouter",
       api: "openai-completions",
-      baseUrl: "https://api.openai.com/v1",
+      baseUrl: "https://openrouter.ai/api/v1",
     } as unknown as Model<"openai-completions">;
 
     const response = await buildGuardedModelFetch(model)(
-      "https://api.openai.com/v1/chat/completions",
+      "https://openrouter.ai/api/v1/chat/completions",
       { method: "POST" },
     );
     const items = [];
@@ -448,6 +472,33 @@ describe("buildGuardedModelFetch", () => {
     expect(items).toEqual([{ ok: true }]);
   });
 
+  it("does not clone Request bodies while checking for streaming JSON fallbacks", async () => {
+    const cloneSpy = vi.spyOn(Request.prototype, "clone");
+    fetchWithSsrFGuardMock.mockResolvedValue({
+      response: new Response('{"ok": true}', {
+        headers: { "content-type": "application/json" },
+      }),
+      finalUrl: "https://api.openai.com/v1/responses",
+      release: vi.fn(async () => undefined),
+    });
+    const model = {
+      id: "gpt-5.5",
+      provider: "openai",
+      api: "openai-responses",
+      baseUrl: "https://api.openai.com/v1",
+    } as unknown as Model<"openai-responses">;
+    const request = new Request("https://api.openai.com/v1/responses", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ model: "gpt-5.5", stream: true }),
+    });
+
+    const response = await buildGuardedModelFetch(model)(request);
+
+    expect(cloneSpy).not.toHaveBeenCalled();
+    expect(response.headers.get("content-type")).toBe("application/json");
+  });
+
   it("preserves JSON bodies when the request is not streaming", async () => {
     fetchWithSsrFGuardMock.mockResolvedValue({
       response: new Response('{"ok": true}', {
@@ -531,13 +582,13 @@ describe("buildGuardedModelFetch", () => {
     });
     const model = {
       id: "gpt-5.4",
-      provider: "openai",
+      provider: "openrouter",
       api: "openai-completions",
-      baseUrl: "https://api.openai.com/v1",
+      baseUrl: "https://openrouter.ai/api/v1",
     } as unknown as Model<"openai-completions">;
 
     const response = await buildGuardedModelFetch(model)(
-      "https://api.openai.com/v1/chat/completions",
+      "https://openrouter.ai/api/v1/chat/completions",
       { method: "POST" },
     );
     const items = [];
diff --git a/src/agents/provider-transport-fetch.ts b/src/agents/provider-transport-fetch.ts
index 43d0687ec88..bbf38be7c55 100644
--- a/src/agents/provider-transport-fetch.ts
+++ b/src/agents/provider-transport-fetch.ts
@@ -172,6 +172,17 @@ function sanitizeOpenAISdkSseResponse(
   });
 }
 
+function shouldSanitizeOpenAISdkSseResponse(model: Model<Api>): boolean {
+  if (model.provider !== "openai") {
+    return true;
+  }
+  try {
+    return new URL(model.baseUrl).hostname.toLowerCase() !== "api.openai.com";
+  } catch {
+    return true;
+  }
+}
+
 async function requestBodyHasStreamTrue(
   request: Request | undefined,
   init: RequestInit | undefined,
@@ -187,12 +198,7 @@ async function requestBodyHasStreamTrue(
   }
 
   let text: string | undefined;
-  if (request) {
-    text = await request
-      .clone()
-      .text()
-      .catch(() => undefined);
-  } else if (typeof init?.body === "string") {
+  if (typeof init?.body === "string") {
     text = init.body;
   }
   if (!text) {
@@ -534,7 +540,7 @@ export function buildGuardedModelFetch(
       result.refreshTimeout,
       localServiceLease,
     );
-    return options?.sanitizeSse === false
+    return options?.sanitizeSse === false || !shouldSanitizeOpenAISdkSseResponse(model)
       ? response
       : sanitizeOpenAISdkSseResponse(response, { synthesizeJsonAsSse });
   };