First model of the day? Step 5 Preview 👇
StepFun releases Step 5 Preview as open weights with 600B total parameters
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StepFun has released Step 5 Preview, a sparse MoE model with 600B total parameters and 27B active per token, as open weights.
BF16 and FP8 weights are available on Hugging Face and ModelScope, and the model supports a 1M-token context window with native text and vision input.
StepFun says it is built for long-horizon agentic work, including coding, software engineering, professional knowledge work, and finance.
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Sophia YangVerified on X
@sophiamyang
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: Sophia Yang · x.comPublished