Step 3.5 Flash
StepFun flash lane for quick multimodal reasoning and coding assistance
ReasoningTool CallingOpen Weights
Context Window
256K
Max Output
256K
Temperature
Yes
Open Weights
Yes
Knowledge Cutoff
2025-01
Released
2026-01-29
Last Updated
2026-02-13
Modalities
Input:Text
→Output:Text
Benchmarks
| Benchmark | Score | Metric |
|---|---|---|
| Artificial Analysis Coding Index | 31.6 | index |
| SciCode | 40.4 | percent correct |
| Terminal-Bench Hard | 27.3 | success rate |
| SWE-Bench Verified | 74.4 | resolved |
Available Providers (5)
| Provider | Input /1M | Output /1M | Cache Read /1M | Cache Write /1M | Reasoning | Status |
|---|---|---|---|---|---|---|
 Qiniu | — | — | — | — | — | — |
 Vercel AI Gateway | Rp 1.624 | Rp 5.411 | Rp 361 | — | effort | — |
 ZenMux | Rp 1.804 | Rp 5.411 | — | — | — | — |
 Kilo Gateway | Rp 1.804 | Rp 5.411 | Rp 361 | — | effort | — |
 OpenRouter | Rp 1.804 | Rp 5.411 | — | — | ✓ | — |