Step 3 5 Flash
Open Source
600B open weights, trained for long-running agents
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.
Step 3 5 Flash is a Open Source company. It has launched 3 products on Product Hunt; the most upvoted was Step 3.7 Flash (182 upvotes).
Step 3 5 Flash timeline
- 600B open weights, trained for long-running agents
- Flash-speed agents model that can see and act
- Frontier open-source MoE model built for OpenClaw agents
People at Step 3 5 Flash
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