StepFun / lineage
StepFun Step family
Step 3.5 Flash and Step 3.7 Flash are distinct checkpoints. Compare observed input modalities, model limits and rating coverage before choosing a replacement.
Family research reviewed · Official source notes below
- Standard models
- 2
- Independently rated
- 1 / 2
- Known token rates
- 2 / 2
- Global balanced frontier
- 0
This collection organises accepted catalogue identities. It does not certify equal weights, a shared licence, benchmark equivalence or current availability on every serving platform.
Compare exact catalogue rows
USD per 1M tokens. In / out are listed base rates; expand billing conditions before planning a request. LMArena scores measure the general preference board, not success on your engineering task. Unknown stays unknown.
Catalogue members
| Model | LMArena | Input / output $/M | Context / max output | Capabilities & conditions |
|---|---|---|---|---|
Step 3.7 Flashstepfun/step-3.7-flash | Unrated | $0.200 / $1.15Listed base ratesBilling details
Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence. | 262,144Output 230,400 | text · image · videoTools yes · reasoning yesWeights unknownReleased 2026-05-28 |
Step 3.5 Flashstepfun/step-3.5-flash | 1403.0±3.5 interval half-widthEffort: default | $0.100 / $0.300Listed base ratesBilling details
Tool, media, cache-write and service-tier charges may add dimensions. Read the full model evidence. | 262,144Output 65,536 | textTools yes · reasoning yesWeights unknownReleased 2026-01-29 |
Sources and scope
- Official Step 3.7 Flash card ↗
Exact named models on the vendor platform; not a promise about every reseller
Checked 2026-09-22 · official document opened and inspected
Source review does not refresh a price or transplant a benchmark score. Read the method and correction policy.
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Questions this page answers
Are the StepFun Step family models interchangeable?
No. These are exact catalogue rows with separate capability, pricing and rating evidence. Compare the checkpoint, serving endpoint, reasoning settings and required input types. A family name does not establish equivalent behaviour.
How many StepFun rows are compared here?
2 standard rows, of which 1 have an accepted LMArena general score and 2 have known input and output token rates. 0 related free or batch variants are listed separately.
What do the prices and frontier counts mean?
Prices below are listed US dollars per million input or output tokens, before request-specific context tiers and other billing dimensions. The frontier count comes from the global balanced view. Neither a family price range nor a benchmark difference proves your task will be cheaper or more successful.
How current are the official notes?
The linked family research was reviewed 2026-09-22. That date is separate from each accepted catalogue observation and each vendor’s effective date. An official note applies to its named platform, not automatically to every reseller.