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Claude Code supports third-party LLM gateways via environment variables. Phaseo exposes an Anthropic-compatible surface at /v1/messages, so you can point Claude Code at Phaseo without changing your prompts. If you want Claude Code to read the live Phaseo documentation during a session, add the Docs MCP server too.

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Set up with the Phaseo CLI

Install Claude Code from its official release first. Setup creates a Phaseo CLI: Claude Code API Key that expires after 90 days and has a $100 monthly spend limit, stores it in the OS credential store, and configures Claude Code’s gateway and API-key helper. The helper creates a new key when the old one expires. No plaintext key is written to Claude Code settings.

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Manual configuration

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Pick a model (optional)

Set ANTHROPIC_MODEL if you want a fixed default. Use model ids listed in Models.

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Start Claude Code

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Endpoint mapping

  • Claude Code calls Anthropic-style endpoints (/v1/messages).
  • Phaseo handles those requests through Anthropic Messages.

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Compatibility notes

  • ANTHROPIC_AUTH_TOKEN is sent as an Authorization header, which Phaseo accepts.
  • You can also set ANTHROPIC_MODEL to A Phaseo model id when you want Claude Code to use one default model.
  • Current limitation: streaming + tools on Anthropic Messages can return 400 invalid_request. If your workflow depends on streamed tool loops, test this path before broad rollout.
Last modified on October 29, 2026