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China's StepFun releases open weights for 600B-parameter Step 5 Preview

Original: 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.

Why now: The scale of the release and its rapid rise on OpenRouter usage charts highlight how competitive Chinese open-weight models have become.

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Evidence

• Chinese AI lab StepFun has released open weights for its Step 5 Preview model, a 600 billion parameter sparse mixture-of-experts system with support for 1 million token context. The model ranks second globally on OpenRouter usage charts. https:// pandaily.com/stepfun-step-5-pr… · china@universeodon.com · 1

API: https://socialmediatrends-api.osmike.com/v1/trends/2348177