Intelligence index
Outperforms 49% of compared models
Step 3.5 Flash
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. It is a reasoning model that is incredibly speed efficient even at long contexts.
- Input / output price
- $0.1/$0.3per 1M tokens
- Context
- 262K
- Released
- 2026-01-29
Pricing
Artificial Analysis
Explore rankingsRelated Models
Step 5 Preview
stepfunStep 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional knowledge work, with particular strength in finance. It is designed for extended tasks that span large codebases and documents, using tools and refining results over multiple steps.
- Context
- 1.0M
- Max output
- 64K
- Released
- 2026-10-08
- Input
- $1/M
- Output
- $2.7/M
- Cache read
- $0.1/M
Step 3.7 Flash
stepfunStep 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.
- Context
- 262K
- Max output
- 230.4K
- Released
- 2026-05-28
- Input
- $0.2/M
- Output
- $1.15/M
- Cache read
- $0.04/M