RELEASED
StepFun launches Step 5 Preview, a 600B-parameter agentic model for coding and finance
2026-09-20
StepFun's new flagship is a sparse MoE (600B total, 27B active) with 1M-token context and image/video input, priced at $1 per million input tokens — undercutting frontier rivals — and aimed at long-horizon agentic work. It is live as a hosted API on the StepFun platform; open weights are promised for October 15, 2026.
Reported by: MarkTechPost · RuntimeWire