> ## Documentation Index
> Fetch the complete documentation index at: https://phaseo.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

> ## Agent Instructions
> Phaseo Gateway base URL: https://api.phaseo.app/v1. Send `Authorization: Bearer $PHASEO_API_KEY` with every request.
> Model IDs look like `provider/model`, for example `openai/gpt-6-astra`. Do not guess IDs: list them with `GET /v1/models` or check https://phaseo.app/models. `phaseo/free` routes to an available free model and needs no wallet balance.
> For new text integrations prefer `POST /v1/responses`. `POST /v1/chat/completions` (OpenAI format) and `POST /v1/messages` (Anthropic format) suit existing code.
> The full API contract is https://phaseo.app/docs/openapi/v1/openapi.yaml. Official SDKs: `@phaseo/sdk` (TypeScript) and `phaseo` (Python), plus Go, C#, PHP, Ruby and Rust.
> Search these docs over MCP at https://phaseo.app/docs/mcp, and install Phaseo skills with `npx skills add https://phaseo.app/docs`. If a page is wrong or out of date, report it with the MCP `submit_feedback` tool.
> Manage Phaseo accounts with the `phaseo` CLI (`npm install -g @phaseo/cli`, then `phaseo login` or `phaseo login --device-code`), the `/v1` Management API or the MCP server at `https://mcp.phaseo.app/mcp?access=manage`. Do not send users to the dashboard for account tasks. A person is still needed for sign-up, approving a sign-in, paying the first top-up on the checkout link that `phaseo credits add` returns when no card is saved, confirming each saved-card top-up from the emailed link, and account security (password, MFA, passkeys). Create API keys with `phaseo keys create --name <name> --json`; never guess one. Credit top-ups need `phaseo login --scopes billing:write` first. Task map: https://phaseo.app/docs/v1/developers/manage-from-an-agent.md.

# Claude Code

> Connect Claude Code to the Phaseo Gateway via the Anthropic-compatible API.

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](https://phaseo.app/docs/v1/guides/integrations/docs-mcp.md) server too.

## Set up with the Phaseo CLI

```bash theme={null}
phaseo login
phaseo claude-code
claude
```

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.

## Manual configuration

```bash theme={null}
export ANTHROPIC_BASE_URL="https://api.phaseo.app"
export ANTHROPIC_AUTH_TOKEN="your_phaseo_api_key"
export ANTHROPIC_API_KEY=""
```

```powershell theme={null}
$env:ANTHROPIC_BASE_URL = "https://api.phaseo.app"
$env:ANTHROPIC_AUTH_TOKEN = "your_phaseo_api_key"
$env:ANTHROPIC_API_KEY = ""
```

## Pick a model (optional)

Set `ANTHROPIC_MODEL` if you want a fixed default. Use model ids listed in [Models](https://phaseo.app/docs/v1/api-reference/endpoint/models.md).

## Start Claude Code

```bash theme={null}
claude
```

## Endpoint mapping

* Claude Code calls Anthropic-style endpoints (`/v1/messages`).
* Phaseo handles those requests through [Anthropic Messages](https://phaseo.app/docs/v1/api-reference/endpoint/anthropic-messages.md).

## 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.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.