cc-haha/docs/guide/faq.en.md
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# FAQ
<p align="right"><a href="./faq.md">中文</a> | <a href="../../README.en.md">Back to README</a></p>
## Q: `undefined is not an object (evaluating 'usage.input_tokens')`
**Cause**: `ANTHROPIC_BASE_URL` is misconfigured. The API endpoint is returning HTML or another non-JSON format instead of a valid Anthropic protocol response.
This project uses the **Anthropic Messages API protocol**. `ANTHROPIC_BASE_URL` must point to an endpoint compatible with Anthropic's `/v1/messages` interface. The Anthropic SDK automatically appends `/v1/messages` to the base URL, so:
- MiniMax: `ANTHROPIC_BASE_URL=https://api.minimaxi.com/anthropic`
- OpenRouter: `ANTHROPIC_BASE_URL=https://openrouter.ai/api`
- OpenRouter (wrong): `ANTHROPIC_BASE_URL=https://openrouter.ai/anthropic` ❌ (returns HTML)
If your model provider only supports the OpenAI protocol, you need a proxy like LiteLLM for protocol translation. See the [Third-Party Models Guide](./third-party-models.en.md).
## Q: `Cannot find package 'bundle'`
```
error: Cannot find package 'bundle' from '.../claude-code-haha/src/entrypoints/cli.tsx'
```
**Cause**: Your Bun version is too old and doesn't support the required `bun:bundle` built-in module.
**Fix**: Upgrade Bun to the latest version:
```bash
bun upgrade
```
## Q: How to use OpenAI / DeepSeek / Ollama or other non-Anthropic models?
This project only supports the Anthropic protocol. If your model provider doesn't natively support the Anthropic protocol, you need a proxy like [LiteLLM](https://github.com/BerriAI/litellm) for protocol translation (OpenAI → Anthropic).
See the [Third-Party Models Guide](./third-party-models.en.md) for detailed setup instructions.