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 pending. The first score is available 7 days after release.
Hugging Face Downloads
1.4K
last 30d
1.4K
all time
HF Likes
117
Relative Adoption Metric pending. The first score is available 7 days after release.
Inference · OpenRouter
Tokens/Day
2.1T
7d avg · listed 4/7
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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