Skip to main content
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.

​
Prerequisites

  • A Phaseo API key.
  • Claude Code installed locally.

​
1) Set gateway environment variables

export ANTHROPIC_BASE_URL="https://api.phaseo.ai"
export ANTHROPIC_AUTH_TOKEN="your_phaseo_api_key"
export ANTHROPIC_API_KEY=""

$env:ANTHROPIC_BASE_URL = "https://api.phaseo.ai"
$env:ANTHROPIC_AUTH_TOKEN = "your_phaseo_api_key"
$env:ANTHROPIC_API_KEY = ""

​
2) Pick a model (optional)

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

​
3) Start Claude Code

claude

​
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 July 9, 2026