StepFun Plan

Connect the subscription endpoint

1. Open Settings → Model configuration → Add AI service.
2. Select StepFun Plan and enter the API key for that subscription.
3. Fetch the model list, select step-5-preview, and save.

The preset uses https://api.stepfun.com/step_plan/v1 with Anthropic Messages. The runtime sends requests to /step_plan/v1/messages; it does not send subscription requests to the ordinary /v1/messages endpoint or append a second /v1 segment. This deployment publishes its model list to Authorization: Bearer rather than the Anthropic x-api-key, so fetching the model list and testing the connection both authenticate with your API key as a Bearer token. The API format remains editable in Advanced.

Model availability still comes from the endpoint. If model discovery is unavailable, add the exact model ID manually. Published limits, input modalities, and thinking levels come from the bundled first-party models.dev record; explicit model settings remain authoritative.

The ordinary StepFun API remains available through a custom endpoint. Existing saved services are not rewritten when this preset is added.

See the official Step Plan API integration guide.