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StepFun releases Step 5 Preview open weights with 600B sparse MoE

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StepFun says BF16 and FP8 weights for Step 5 Preview are now available on Hugging Face and ModelScope, alongside a technical blog.

The model is a sparse MoE with 600B total parameters, 27B active per token, a 1M-token context window, and native text and vision input.

StepFun positions it for long-horizon agentic work in coding, software engineering, professional knowledge work, and finance.

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Step 5 Preview is now open weights.

BF16 and FP8 weights are live on Hugging Face and ModelScope, together with our technical blog.

  • Sparse MoE: 600B total, 27B active per token
  • 1M-token context window
  • Native text and vision input
  • Built for long-horizon agentic work: coding, software engineering, professional knowledge work and finance

Frontier intelligence, open weights. Build what's next.

Hugging Face: https://huggingface.co/stepfun-ai/Step-5-Preview
ModelScope: https://modelscope.ai/models/stepfun-ai/Step-5-Preview
GitHub: https://github.com/stepfun-ai/Step-5-Preview

This story is featured in top picks: “StepFun releases open weights for Step 5 Preview and publishes its architecture blog”

Source: StepFun · x.comPublished

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AI agentsMultimodal AIOpen-source ecosystemChina AIModel releases