Open sourceReported
StepFun Releases Step 5 Preview Open weightsReleased model parameters. Availability of weights alone does not make a model open source; check its license and accompanying materials.Read glossary entry: 600B MoE, 27B Active, 1M Context
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1 publisherMarkTechPostPublisher reporting · 17 Oct 2026
StepFun Releases Step 5 Preview Open Weights: 600B MoE, 27B Active, 1M Context ↗
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