# 10 Provider Variation

Script: `example/10_provider_variation.py`.

Provider variation keeps agent/session/tool code fixed and swaps only the `Provider`.

```bash
python example/10_provider_variation.py
python example/10_provider_variation.py anthropic
```

| Path | Config |
| --- | --- |
| OpenAI-compatible | `OPENAI_API_KEY`, optional `OPENAI_BASE_URL`, `OPENAI_DEFAULT_MODEL`. |
| Anthropic | `ANTHROPIC_API_KEY`, `Provider(provider_kind="anthropic", ...)`. |
| LiteLLM | Install `openrath[litellm]`, then use `Provider(provider_kind="litellm", model="provider/model")`. |
| Embedding | `llm.embedding_provider` plus `EmbeddingProvider`. |
| VLM | `llm.vlm_provider` plus `VLMProvider`. |

Use this example as the starting point for documenting provider choice in application code.

The v1.2.2 script itself demonstrates OpenAI-compatible and Anthropic paths.
LiteLLM uses the same `Provider`/`chat_client_for` registry boundary but requires
the optional extra.

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