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 per token. The model supports a 256K context window and exposes selectable reasoning levels (high/medium/low), letting callers trade off speed, cost, and depth of reasoning.
Designed for coding, agentic workflows, structured outputs, and long-context productivity tasks.
Modalities
Input Price
$0.20/M
Output Price
$1.15/M
Context
256K
Released
May 28, 2026