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# Token Caching and Cost Optimization
Qwen Code automatically optimizes API costs through token caching when using API key authentication (e.g., OpenAI-compatible providers). This feature reuses previous system instructions and context to reduce the number of tokens processed in subsequent requests.
**Token caching is available for:**
- API key users (Gemini API key)
- Vertex AI users (with project and location setup)
**Token caching is not available for:**
- OAuth users (Google Personal/Enterprise accounts) - the Code Assist API does not support cached content creation at this time
You can view your token usage and cached token savings using the `/stats` command. When cached tokens are available, they will be displayed in the stats output.
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