congrats to the StepFun team on releasing Step 5 Preview open weights today
we’re excited to be a launch partner and to support another StepFun release as they bring Step 5 Preview to developers
StepFun releases Step 5 Preview open weights with 600B parameters
AIStepFun has released open weights for Step 5 Preview, a sparse MoE model with 600B total parameters and 27B active per token. The model has a 1M-token context window, accepts text and vision input, and targets long-horizon agentic work such as coding 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
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Together AI · x.comPublished
Original title: congrats to the StepFun team on releasing Step 5 Preview open weights today