{"type":"post","id":"stepfun-publishes-step-5-preview-open-weights-600b-5a7d50","slug":"stepfun-publishes-step-5-preview-open-weights-600b-5a7d50","title":"StepFun publishes Step 5 Preview open weights: 600B-parameter MoE with 27B active and up to 1M-token context","description":"StepFun has published the weights for Step 5 Preview on Hugging Face.","retrieval_nugget":"StepFun has published the weights for Step 5 Preview on Hugging Face.","published_at":"2026-10-23","updated_at":"2026-10-23","record_date":"2026-10-23","date_kind":"published_at","topics":["open-models","models"],"entities":["StepFun","Step 5 Preview","Hugging Face","vLLM"],"related_patterns":[],"novelty_label":"same_event","what_changed":"Same event as StepFun releases Step 5 Preview open weights: 600B-parameter MoE with 27B active and 1M-token context","prior_refs":["memory:08668979-32f5-8447-a271-bcb238b8911d"],"source_url":"https://tsnmedia.org/stepfun-step-5-preview-open-weights","source_urls":["https://tsnmedia.org/stepfun-step-5-preview-open-weights"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:stepfun-publishes-step-5-preview-open-weights-600b-5a7d50","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/stepfun-publishes-step-5-preview-open-weights-600b-5a7d50/","markdown":"https://newruntime.com/posts/stepfun-publishes-step-5-preview-open-weights-600b-5a7d50.md","json":"https://newruntime.com/posts/stepfun-publishes-step-5-preview-open-weights-600b-5a7d50.json"},"next_reads":[{"type":"topic","path":"/topics/open-models/","url":"https://newruntime.com/topics/open-models/","title":"Open Models","reason":"Explore the open-models topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/open-models.md","json_url":"https://newruntime.com/topics/open-models.json"},{"type":"topic","path":"/topics/models/","url":"https://newruntime.com/topics/models/","title":"Models","reason":"Explore the models topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/models.md","json_url":"https://newruntime.com/topics/models.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}