StepFun releases Step 5 Preview open weights with 600B parameters and 1M context
StepFun has released Step 5 Preview as open weights on Hugging Face and ModelScope. The model is a sparse Mixture-of-Experts with 600B total parameters, 27B active per token, and up to 1M tokens of context. It is positioned for agentic work such as coding agents, document analysis, and finance workflows. The API launched September 20 and weights followed on October 14. StepFun reports the model…
Key points
- Step 5 Preview has 600B total parameters, 27B active per token, and up to 1M-token context
- API pricing is $1.00 per 1M input tokens and $2.70 per 1M output tokens
- Best independent score is 88.3% on AA-LCR long-context reasoning
StepFun Releases Step 5 Preview Open Weights: 600B MoE, 27B Active, 1M Context
MarkTechPost · 17 October 2026
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