StepFun lists Step 5 Preview flagship model on OpenRouter
StepFun's Step 5 Preview is now listed on OpenRouter. It is a sparse Mixture-of-Experts flagship model with 27B active and 600B total parameters, aimed at agentic work and software engineering.
First seen 8 Oct, 12:34 UTC on OpenRouter3 sourcesLast update 1d ago
StepFunLaunch · 8 Oct
Step 5
From the community, not yet confirmed
What the sources say
Linked, never rewritten. Official means the lab itself.
Official0
No word from StepFun yet.
How it unfolded
Every source in the order it appeared. Times in UTC.