AGI Pulse
Model releaseStepFun · StepFun

StepFun launches Step 5 Preview: 600B/27B MoE agent flagship, open weights Oct 15

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AGI Pulse editors

Published
2026-09-20
Type
Model release
Organization
StepFun
Source
StepFun

Why it matters

  • StepFun announced Step 5 Preview as its flagship for agentic work—software engineering and professional knowledge work, with a finance focus.
  • Claimed specs: 600B total / 27B active MoE, 1M context, vision (text/image/video), lower task cost at comparable intelligence, and long-horizon runs (up to 24h in tests).
  • Platform API id step-5-preview is available now; open weights planned Oct 15.
  • Official model page and docs linked in the announcement.

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