StepFun models
We track 4 StepFun models, 3 of them with open weights. The most recent release is Step 5 Preview, released 16 Sept 2026.
| Model | Released | Context | Input $/1M | Output $/1M | Weights |
|---|---|---|---|---|---|
| Step 5 Preview | 16 Sept 2026 | 1M | $1 | $2.70 | Closed |
| Step 3.7 Flash | 29 May 2026 | 262K | $0.20 | $1.15 | Open |
| Step 3.5 Flash 2603 | 2 Apr 2026 | 256K | – | – | Open |
| Step 3.5 Flash | 29 Jan 2026 | 262K | $0.09 | $0.30 | Open |