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
Protocols
Custom
Organizations
| Organization | Families | Models |
|---|---|---|
| StepFun | 1 | 3 |
Models
3 of 3 model versions
| Model | Organization | Family | Provider model ID | Context | Max output | Input | Output | Reasoning | Tool call | Structured | Temperature | Weights | Pricing | Released | Updated | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Step 3.7 Flash stepfun/step/3-7-flash | StepFun | Step | step-3.7-flash Custom · Streaming | 256K | 256K | TextImageVideo | Text | Yes | Yes | -No | Yes | Open weight | input $0.185/M · cache read $0.037/M output $1.11/M | 2026-05-29 | 2026-06-29 | |
| Step 3.5 Flash 2603 stepfun/step/3-5-flash-2603 | StepFun | Step | step-3.5-flash-2603 Custom · Streaming | 256K | 256K | Text | Text | Yes | Yes | -No | Yes | Open weight | input $0.1/M · cache read $0.02/M output $0.3/M | 2026-04-02 | 2026-04-02 | |
| Step 3.5 Flash stepfun/step/3-5-flash | StepFun | Step | step-3.5-flash Custom · Streaming | 256K | 256K | Text | Text | Yes | Yes | -No | Yes | Open weight | input $0.1/M · cache read $0.02/M output $0.3/M | 2026-01-29 | 2026-06-15 |