Requesting: https://api.moonshot.cn/v1/chat/completions
Model: moonshot-v1-8k
Key (first 10 chars): sk-KxIAQVt...

HTTP 401 Unauthorized. Troubleshooting:
1. Verify key is copied correctly (no extra spaces)
2. Check key is activated at https://platform.moonshot.cn/
3. Verify account has billing/credits added
4. Try model 'moonshot-v1-8k' instead of kimi-k2-5
5. Ensure you're using platform.moonshot.cn keys (not kimi.moonshot.cn web keys)

Raw response: {"error":{"message":"Invalid Authentication","type":"invalid_authentication_error"}}