Step 5 Preview
600B open weights, trained for long-running agents
Artificial IntelligenceOpen Source
▲ 0 votes6 commentsLaunched Oct 17, 2026
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Step 5 Preview is StepFun's open-weight MoE for coding, financial research and long-running agents. It has 600B total parameters, 27B active per token and a 1M-token context, with deployment support for vLLM, SGLang and Transformers.
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