OpenRouter weekly ranking global second, this domestic model is finally open-sourced

What happened: StepFun open-sourced weights for Step 5 Preview in BF16 and FP8 versions on Hugging Face and ModelScope, after the model reached second place on OpenRouter's weekly Token usage ranking. Key numbers: 600B total parameters, 27B activated, 1M token context, 92 Transformer modules, Intelligence Index score 44, about 18.8 trillion tokens used Why it matters: The release puts a sparse MoE model into open deployment channels, with StepFun citing balanced results on software engineering, professional knowledge, and finance benchmarks, and a two week free trial via Tencent WorkBuddy.

OpenRouter weekly ranking second globally signals competitive open-source model release.

OpenRouter weekly ranking second globally signals competitive open-source model release. — impact context not separately stored; see What changed.