Conclusion
- A 401 usually means key, project, endpoint, model permission, or client config—not model quality.
- Use current Zhipu/GLM docs for endpoint and model names because stale examples cause false failures.
- Compatible clients can silently keep an old OpenAI base_url if only the key is changed.
- For production, log provider, route, model, request id, status, and sanitized error body so fallback can work.
What to do next
- Create or rotate a GLM/Zhipu key and confirm it belongs to the same account, project, billing profile, and model permission set you are testing.
- Copy the current official compatible base_url, model name, and Authorization format; do not reuse screenshots or old snippets.
- Send one minimal chat request with Authorization: Bearer YOUR_KEY and record status, request id, latency, and error body.
- Confirm the actual app, coding tool, or agent config uses the GLM base_url, key, and model instead of default OpenAI settings.
- If 401 persists, test another enabled GLM model, check quota/billing, then add Qwen or DeepSeek fallback while access is fixed.
- Use OpenLLMAPI or a proxy with visible request logs when multiple tools need the same GLM route and fallback policy.
Recommended paths
| Provider | Free / credits | Best for |
|---|---|---|
| Zhipu GLM | Signup tokens vary | Domestic GLM-compatible endpoint and model-specific permission checks |
| Qwen | Signup credits vary | Alternative China-friendly compatible route while GLM auth is fixed |
| DeepSeek | Pricing/credits vary | Low-cost fallback for coding and reasoning tasks |
| OpenLLMAPI | Trial varies | Request logs, fallback, one compatible key, and visible route diagnostics |
Global developer checklist
- Confirm whether signup, billing, and API keys work from your country before writing production code.
- Prefer OpenAI-compatible endpoints when you may need to switch models, regions, or providers later.
- Test free credits with a real smoke prompt and record latency, error shape, streaming behavior, and quota burn.
- Keep at least one fallback route for provider outages, model deprecations, and regional access changes.
Production handoff
Debug GLM with logs and fallback
Put GLM, Qwen, and DeepSeek behind one compatible route so 401 setup errors are visible, failed calls can fall back, and signup is tagged for GLM troubleshooting intent.
FAQ
Can a wrong model name cause unauthorized?
Yes. Some providers return auth-like errors when the key lacks permission for that model, project, route, or billing state.
Why does my OpenAI SDK still call OpenAI?
Many clients require both base_url/baseURL and api_key to be set explicitly. Check logs, proxy traces, or request destination to confirm.
Should I expose the GLM key in frontend code?
No. Keep GLM keys server-side, in a worker, or behind a protected gateway. Rotate any key that was pasted into client code.
What should I log for GLM 401 debugging?
Provider, configured route, model, status code, request id if present, retry count, timestamp, and sanitized error body. Never log raw keys.
What should I do if the key is valid but the tool fails?
Run the same request through curl first. If curl works, the issue is usually the tool profile, preset, environment variable, or streaming/tool-call compatibility.