This article provides a technical guide for developers looking to use Anthropic's Claude Code with non-Anthropic backends, such as those offered by OpenAI-compatible gateways or cloud services like Google Cloud Vertex AI. It details crucial environment variables like ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN, emphasizing the correct format for authentication headers to avoid 401 errors. The guide also highlights the importance of configuring default model aliases, particularly ANTHROPIC_DEFAULT_HAIKU_MODEL, for cost optimization during background operations, and explains how to enable features like tool search and manage timeouts for a smoother user experience. AI
IMPACT Enables developers to optimize Claude Code usage and costs when integrating with diverse backend infrastructures.
RANK_REASON Article provides technical guidance on configuring an existing AI product (Claude Code) with third-party backends, rather than announcing a new product or research.
- Anthropic
- ANTHROPIC_API_KEY
- ANTHROPIC_AUTH_TOKEN
- ANTHROPIC_BASE_URL
- ANTHROPIC_DEFAULT_HAIKU_MODEL
- ANTHROPIC_DEFAULT_OPUS_MODEL
- ANTHROPIC_DEFAULT_SONNET_MODEL
- ANTHROPIC_MODEL
- Claude Code
- ENABLE_TOOL_SEARCH
- Google Cloud Vertex AI
- LiteLLM
- OpenAI
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