First party
StepFun (China)
StepFun (China) is a First party provider with 3 models across 3 offerings.
Access
- API base URL
- https://api.stepfun.com/v1
- SDK
- @ai-sdk/openai-compatible
- Environment variables
- STEPFUN_API_KEY
Models
3 of 3 model versions
| Model | Family | Provider model ID | Protocol | Streaming | Organization | Context | Max output | Input | Output | Reasoning | Tool call | Structured | Temperature | Weights | Price | Released | Updated | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Step 3.7 Flash stepfun/step-3.7-flash | STStepFun | Step | step-3.7-flash | Custom | Yes | 256K | 256K | Yes | Yes | -No | Yes | Open | input $0.185/M · output $1.11/M cache read $0.037/M | 2026-05-29 | 2026-08-06 | |||
| Step 3.5 Flash 2603 stepfun/step-3.5-flash-2603 | STStepFun | Step | step-3.5-flash-2603 | Custom | Yes | 256K | 256K | Yes | Yes | -No | Yes | Open | input $0.1/M · output $0.3/M cache read $0.02/M | 2026-04-02 | 2026-04-02 | |||
| Step 3.5 Flash stepfun/step-3.5-flash | STStepFun | Step | step-3.5-flash | Custom | Yes | 256K | 256K | Yes | Yes | -No | Yes | Open | input $0.1/M · output $0.3/M cache read $0.02/M | 2026-01-29 | 2026-08-06 |