Step
StepFunProprietary
10 models2024–2026Up to 256K ctxFrom $0.1/1M input
About
The Step family of large language models developed by StepFun (阶跃星辰), one of China's leading AI startups. The series includes Step-1 and Step-2, offering strong multilingual text generation, reasoning, and code generation capabilities. Step models are accessible via StepFun's API platform.
Specifications(10 models)
| Model | Released | Context | Parameters | Vision | Multimodal | Reasoning | Fn Calling |
|---|---|---|---|---|---|---|---|
| Step 3.5 Flash | 2026-01 | 256K | 196B (11B active) | No | No | Yes | No |
| StepFun Step-2 | 2025-10 | 128k | — | No | No | No | No |
| StepFun Step-1 | 2025-08 | 128k | — | No | No | No | No |
| Step-2 | 2024-09 | 256K | — | Yes | Yes | No | Yes |
| Step-1V Turbo | 2024-07 | — | — | No | Yes | No | No |
| Step-1.5V | 2024-06 | 128K | — | Yes | Yes | No | No |
| Step-1 | 2024-04 | 128K | — | No | No | No | No |
| Step-1V | 2024-03 | — | — | No | Yes | No | No |
| Step-Instruct | 2024-03 | — | — | No | No | No | No |
| Step-Math | 2024-03 | — | — | No | No | No | No |
Available From(2 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Step 3.5 Flash | OpenRouter | $0.1 | $0.3 | Serverless |
Frequently Asked Questions
- What is Step?
- The Step family of large language models developed by StepFun (阶跃星辰), one of China's leading AI startups. The series includes Step-1 and Step-2, offering strong multilingual text generation, reasoning, and code generation capabilities. Step models are accessible via StepFun's API platform.
- How many models are in the Step family?
- The Step family contains 10 models.
- What is the latest Step model?
- The latest model is Step 3.5 Flash, released in 2026-01.
- How much does Step cost?
- Step models are available at $0.1/1M input tokens through providers like OpenRouter.
Models(10)
Step 3.5 Flash
2026-01256K196B (11B active)1 provider
ReasoningOpen Source
StepFun Step-2
2025-10128k
StepFun Step-1
2025-08128k
Step-2
2024-09256K1 provider
Multimodal
Step-1V Turbo
2024-07
Multimodal
Step-1.5V
2024-06128K1 provider
Multimodal
Step-1
2024-04128K1 provider
Step-1V
2024-03
Multimodal
Step-Instruct
2024-03
Step-Math
2024-03