StepFun @StepFun_ai

One week since launch, Step 5 Preview is already #2 on OpenRouter's weekly leaderboard, with 19.5T tokens used. It has also held #2 on the daily leaderboard since Oct 10. Thanks to everyone building with us. https://t.co/WiffzH5JP2

• StepFun Releases Step-5-Preview Flagship Model2026-10-15