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Step 3.7 Flash

StepFun · 2026-05-29 · 201.4B parameters

Step 3.7 Flash is StepFun's multimodal Mixture-of-Experts model released on May 29, 2026. It is marketed as a 198B model combining a 196B sparse language backbone with a 1.8B vision encoder; the complete released checkpoint contains 201,365,316,160 parameters. Activating approximately 11B parameters per token, it is designed for agentic workflows, coding tasks, and search-augmented pipelines.

Benchmark scores

BenchmarkScore
AA-LCR63.7
AA-LCR v1.173.7
AA-Omniscience Index-37.3
AIME 202695.0
ALE-Bench1277
Apex (MathArena)14.6
Apex Shortlist76.6
APEX-Agents-AA (avg@3)14.8
Artificial Analysis Agentic Index21.5
Artificial Analysis Coding Index39.6
Artificial Analysis Intelligence Index30.3
Artificial Analysis Omniscience Accuracy25.8
Artificial Analysis Omniscience Hallucination Rate85.0
Artificial Analysis Openness Index38.9
Artificial Analysis Progress Index v1264
ArXivLean 06/20260.0
ArXivMath — Overall38.0
ArXivMath 02/202632.0
ArXivMath 03/202645.0
ArXivMath 04/202635.8
ArXivMath 05/202646.7
ArXivMath 06/202630.6
AutomationBench-AA7.0
BLXBench55.2
BLXBench Coding category25.7
BLXBench Cost category66.0
BLXBench Debugging category62.4
BLXBench Hallucination category75.8
BLXBench pass rate38.1
BLXBench Reasoning category67.1
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