Hugging Face (Twitter)
RT @HuggingPapers: StepFun's Step 3.5 Flash
A sparse MoE model with 196B parameters, 11B active per token.
Achieves frontier-level reasoning comparable to GPT-5.2 xHigh and Gemini 3.0 Pro at 1/6th the decoding cost.
Ranks #1 on MathArena with 97.3% on AIME 2025.
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