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.
Set up with the Phaseo CLI
Setup installs Claude Code when needed, creates a non-expiring Phaseo CLI: Claude Code API Key, stores it in the OS credential store, and configures Claude Code’s gateway and API-key helper. No plaintext key is written to Claude Code settings.
Manual configuration
Pick a model (optional)
Set ANTHROPIC_MODEL if you want a fixed default. Use model ids listed in Models.
Start Claude Code
Endpoint mapping
- Claude Code calls Anthropic-style endpoints (
/v1/messages).
- Phaseo handles those requests through Anthropic Messages.
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 August 14, 2026
