Use Cosmic 1 through the API.

curl https://ultrac.io/v1/chat/completions \
  -H "Authorization: Bearer $ULTRAC_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "cosmic-1",
    "messages": [{"role": "user", "content": "Analyze this incident."}]
  }'

Sign in with ultrac login and the CLI creates a key for your machine. For scripts and SDKs, create a key on the API keys page after your account is approved. Copy it when it is created; it is shown once. We store only a hash, and you can revoke the key at any time.

Set stream: true to receive server-sent events. Send tools to offer functions the model can call; use tool_choice to control tool selection. Calls are returned in tool_calls. The request reference includes a worked example.

For work that may outlast one request, create a task with POST /v1/runs. It returns a run ID before a worker starts the model. Follow the task over server-sent events. If the stream disconnects, reconnect with Last-Event-ID to receive missed events; the task keeps running. Event-stream requests remain subject to API rate limits. See Long-running tasks for the endpoints and a copyable loop.

Session, daily, and weekly limits apply together. The daily limit is the maximum for one day; multiplying it by seven does not increase your weekly allowance. A request is rejected when any applicable limit is reached.

A request over the limit answers 429 with a retry-after header. Full reference, including the request fields and error codes, is in the docs.