SAI lab · 3 models tracked
StepFun models
Every StepFun model released in the last 18 months, with release dates, context windows, API prices and benchmark scores. Newest: Step 5 Preview, 12d ago.
- Models · 30 days
- 1 of 3
- Latest release
- 12d ago
- Cheapest input / 1M
- $0.10 Step 3.5 Flash
- Largest context
- 1M Step 5 Preview
Release history
Timeline
StepFun ships a new model about every 126 days. Each dot is a release; click one to open it.
Lineup
All StepFun models
| Model | Released | Context | Input / 1M | Output / 1M | GPQA Diamond |
|---|---|---|---|---|---|
Step 5 Previewstepfun/step-5-preview |
Oct 8, 2026 | 1M64K out | $1.00 | $2.70 | — |
Step 3.7 Flashstepfun/step-3.7-flash |
May 28, 2026 | 262K230K out | $0.20 | $1.15 | — |
Step 3.5 Flashstepfun/step-3.5-flash |
Jan 29, 2026 | 262K66K out | $0.10 | $0.30 | — |
Benchmarks
StepFun's best scores
The top StepFun model on each benchmark, and where it ranks among all 222 tracked models.
| Benchmark | Best StepFun model | Score | Overall rank |
|---|---|---|---|
| SciCodeSoftware engineering | Step 5 Preview | 58.9% | #11of 93 |
| WebDev ArenaDesign & visual | Step 5 Preview | 1570 | #29of 88 |
| CritPtReasoning & knowledge | Step 5 Preview | 20.9% | #20of 96 |
| ProofBenchMaths | Step 5 Preview | 42.0% | #39of 70 |
Directory
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