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AI IntelligenceSep 28, 2026AI Intelligence

Article

StepFun debuts Step 5 Preview model with 600B parameters

StepFun launched its Step 5 Preview model, a sparse Mixture of Experts model with approximately 600 billion total parameters and 27 billion active parameters. The model features a 1 million token context window for long-horizon agents, with its API live now and BF16 open weights scheduled for October 15, 2026.

Frontier EditorialSep 28, 2026Source: Pandaily

Source Brief

StepFun debuts Step 5 Preview model with 600B parameters: StepFun launched its Step 5 Preview model, a sparse Mixture of Experts model with approximately 600 billion total parameters and 27 billion active parameters. The model features a 1 million token context window for long-horizon agents, with its API live now and BF16 open weights scheduled for October 15, 2026.

StepFun Step 5 Preview Mixture of Experts open weights Read the issue

Source Brief

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