StepFun previews Step 5: 600B MoE with 27B active at $1/$2.7 per M tokens, open weights next month
nemamdsa12 · reddit · 2026-09-21
A Reddit thread discusses StepFun's newly previewed Step 5 model: a 600B-parameter MoE with 27B active, priced at $1/$2.7 per million tokens, with open weights promised next month—apparently skipping Step 4 entirely.
The poster is impressed by its 3D demo, a room-scale model where furniture can be dragged around, and is asking whether anyone has run it on real workloads yet.
More from Models
- Codex limits draining 5x faster with 18% less usage, dev's tracking claims — StewartalsopIII · 2026-09-21
- Observation: Models Differ Wildly in Tool-Call Intermediate Steps — DanielLockyer · 2026-09-21
- Rumor: Anthropic's Opus 5.5 landing this week, said to beat Astra on price and quality — daniel_mac8 · 2026-09-21
- Burkov calls stealthy LLM-rival project Jev 'BS' over speed and calibration claims — burkov · 2026-09-21
- Moonshot and Tencent Hunyuan both building Flash models to target agent inference costs — TheZachMueller · 2026-09-21
- Dev Launches Made With Jev, a Free Directory Cataloging Demos, Tools and Skills for the New Model — Sea_Supermarket_5891 · 2026-09-21