Choblin(@choblin29):🚨BREAKING: China's StepFun has officially launched Step 5 Preview, a 600B MoE model with just 27B active parameters and a 1M-token context window. Step 5 Preview matches Kimi K3 (max) at 44 on Artificial Analysis, but at about 65% lower cost per task. StepFun is now on the cost/intelligence Pareto frontier. The model is available via API now, and StepFun says it will release the weights on October 15. China keeps shipping

2026.09.20 05:24

🚨BREAKING: China's StepFun has officially launched Step 5 Preview, a 600B MoE model with just 27B active parameters and a 1M-token context window. Step 5 Preview matches Kimi K3 (max) at 44 on Artificial Analysis, but at about 65% lower cost per task. StepFun is now on the cost/intelligence Pareto frontier. The model is available via API now, and StepFun says it will release the weights on October 15. China keeps shipping