A new flagship model by StepFun, which follows its peers and comes with a revenue-gated license. Its previous model, Step-3.7, was released under Apache 2.0.
Specs
Params600B
LicenseStepFun Model License 1.0
Adoption · Hugging Face
RAM score
Relative Adoption Metric not scored because required parameter, download, or API metadata is not cataloged. This is not a zero score.
Hugging Face Downloads
5.7K
last 30d
5.7K
all time
HF Likes
137
Relative Adoption Metric not scored because required parameter, download, or API metadata is not cataloged. This is not a zero score.
Inference · OpenRouter
Tokens/Day
953.8B
7d avg · listed 7/7
Peak Tokens/Day
3.7T
14 Oct 2026
Peak Rank
#2
09 Oct 2026
OpenRouter publishes daily token totals for its ~50 most-served models. Days missing from the chart mean Step 5 Preview fell below that cutoff — not zero usage. OpenRouter logs usage separately per dated model version and per variant (like ":free"); the hub combines provider variants while keeping separately cataloged releases distinct.
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