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Chinese AI lab StepFun unveils Step 5 Preview model

Original: Chinese AI lab StepFun has unveiled Step 5 Preview, a sparse mixture of experts model with roughly 600 billion total par

Chinese AI lab StepFun has unveiled Step 5 Preview, a sparse mixture-of-experts model with roughly 600 billion total parameters and about 27 billion active per token. The model supports a one million token context window and is designed for long-horizon agent work, with open weights. Observers are noting the specifications and what the release means for competition among Chinese AI labs and open-weight model development.

Why now: A major new open-weight AI model release from a leading Chinese lab draws attention amid fierce global AI competition

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• Chinese AI lab StepFun has unveiled Step 5 Preview, a sparse mixture of experts model with roughly 600 billion total parameters and about 27 billion active per token. The model supports a one million token context window and is designed for long-horizon agent work. Open weights… · china@universeodon.com · 1

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