Step-3.5-Flash

ai model→ stable

Step-3.5-Flash, developed by StepFun, is a 196B parameter open-source model that uses a sparse mixture-of-experts architecture with 11B active parameters to deliver frontier-level reasoning and coding performance efficiently.

1Total Mentions

+0.80Sentiment (Very Positive)

+1.2%Velocity (7d)

First seen: Mar 24, 2026Last active: 6h ago

Timeline

Product LaunchFeb 24, 2026
Open-source MoE model released, outperforming Kimi K2.5 and Claude Opus 4.5 on key benchmarks with 18.9x lower operational cost.
View source
cost advantage:
18.9x less than Kimi K2.5
architecture:
Sparse Mixture-of-Experts

Relationships

Uses

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Sparse Mixture-of-Experts
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AIME 2025
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LiveCodeBench v6
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Competes With

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Kimi K2.5
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Claude Opus 4.6
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Developed

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StepFun
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Recent Articles

Step-3.5-Flash: 196B Open-Source MoE Model Activates Only 11B Parameters, Outperforms Kimi K2.5 and Claude Opus 4.5 on Key Benchmarks
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Shanghai-based StepFun's Step-3.5-Flash, a 196B parameter sparse mixture-of-experts model that activates only 11B parameters per token, achieves top s
6h ago86 relevance

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