Step 3.5 Flash 2603
StepFun flash model for efficient multimodal reasoning, coding, and tool use
ReasoningTool CallingOpen Weights
Context Window
256K
Max Output
256K
Temperature
Yes
Open Weights
Yes
Knowledge Cutoff
2025-01
Released
2026-04-02
Last Updated
2026-04-02
Modalities
Input:Text
→Output:Text
Benchmarks
| Benchmark | Score | Metric |
|---|---|---|
| Artificial Analysis Coding Index | 34.6 | index |
| SciCode | 38.5 | percent correct |
| Terminal-Bench Hard | 32.6 | success rate |
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