StepFun models
StepFun publishes 2 models available on Zeplik. Pricing, context windows and capabilities below come straight from the live registry Zeplik routes and bills against.
All 2 StepFun models
Step 3.7 FlashFast and light
Step 3.7 Flash is StepFun's latest high-efficiency multimodal Mixture-of-Experts model. It pairs a 196B-parameter language backbone with a vision encoder for native image and video understanding, activating roughly 11B parameters...
256K ctx12.7 cr/M outMay 2026
Step 3.5 FlashFast and light
Step 3.5 Flash is StepFun's most capable open-source foundation model. Built on a sparse Mixture of Experts (MoE) architecture, it selectively activates only 11B of its 196B parameters per token....
262K ctx3.3 cr/M outJanuary 2026
Pricing at a glance
| Model | Context | Input cr/M | Output cr/M | Released |
|---|---|---|---|---|
| Step 3.7 Flash | 256K | 2.2 | 12.7 | May 2026 |
| Step 3.5 Flash | 262K | 1.1 | 3.3 | January 2026 |