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The Climb Lab
Trends
- 1China's StepFun releases open weights for 600B-parameter Step 5 Preview●Chinese AI lab StepFun has released open weights for its Step 5 Preview model, a 600 billion parameter sparse mixture-of
Chinese AI lab StepFun has released open weights for its Step 5 Preview model, a 600 billion parameter sparse mixture-of-experts system supporting 1 million token contexts. The model has quickly climbed to second place globally on OpenRouter's usage charts, drawing attention to the growing competitiveness of Chinese open-weight AI models against leading Western offerings.