Step 3.5 Flash: benchmark results
StepFun's speed-oriented Step 3.5 Flash sparse MoE (196B total, 11B active). Provider: StepFun. Released 2026-02-02. Access: Open.
Unified ELO 1630 ± 1, rank #181 of 1392 rated models, from 142 benchmark results.
Strongest benchmark results
| Benchmark | Score | Metric | Percentile |
|---|---|---|---|
| OpenEvals - AIME 2026 | 96.67 | Accuracy (%) | 100 |
| OpenCompass Research - LiveCodeBench v6 | 83.9 | Score (%) | 97.9 |
| MathArena - BRUMO 2025 | 100 | Accuracy (%) | 97.8 |
| MathArena - CMIMC 2025 | 93.75 | Accuracy (%) | 97.1 |
| MathArena - HMMT Feb 2025 | 98.33 | Accuracy (%) | 96.6 |
| OpenCompass Research - AIME 2025 | 95.7 | Score (%) | 95.7 |
| MathArena - AIME 2025 | 98.33 | Accuracy (%) | 95.1 |
| ALL Bench LLM | 77.28 | Average Numeric Benchmark Score (%) | 94.7 |
| AA TAU-2 Bench | 94.44 | Accuracy (%) | 92.9 |
| MATH-MC Level 1 | 99.07 | Accuracy (%) | 92.6 |
| AA Omniscience - Software Engineering (SWE) - Dart | 36 | Accuracy (%) | 92.2 |
| SWE-rebench | 59.58 | Resolved (%) | 91.7 |
Interactive version: theaggregate.ai/model?slug=step-3-5-flash · How It Works · Data refreshed daily, snapshot 2026-09-05.