OpenRouter
provider: 'openrouter'
OpenRouter is an aggregator: it reaches every maat-supported model through a single API key and a single OpenAI-compatible endpoint. Use it to try models from different vendors without provisioning each first-party account.
Authentication
Get an API key from OpenRouter and pass it through extra.apiKey:
ts
{
provider: 'openrouter',
model: 'claude-opus-4-8',
extra: { apiKey: process.env.OPENROUTER_API_KEY },
}maat sends the HTTP-Referer and X-Title headers OpenRouter uses for attribution automatically.
Configuration
| Field | Required | Description |
|---|---|---|
extra.apiKey | Recommended | OpenRouter API key. |
extra.baseUrl | Optional | Override the endpoint. Defaults to https://openrouter.ai/api/v1. |
Models
Every supported model is available. maat maps the model id to the OpenRouter slug automatically:
model | OpenRouter slug |
|---|---|
gemini-3-5-flash | google/gemini-3.5-flash |
gemini-3-1-pro-preview | google/gemini-3.1-pro-preview |
claude-sonnet-4-6 | anthropic/claude-sonnet-4.6 |
claude-opus-4-8 | anthropic/claude-opus-4.8 |
claude-haiku-4-5 | anthropic/claude-haiku-4.5 |
grok-4-3 | x-ai/grok-4.3 |
gpt-5-4 | openai/gpt-5.4 |
gpt-5-5 | openai/gpt-5.5 |
JSON output
OpenRouter routes JSON enrichers through response_format: json_schema (strict: true). Schema enforcement ultimately depends on the upstream model's support. See JSON output and schemas. temperature is sent only for Gemini models.