StepFun
Step 5 Preview
StepFun's next-generation flagship base model for coding and professional knowledge work, with native text, image, and video input and a 1M-token context window
stepfun/step-5-preview
Context
1M
Output
1M
Released
2026-09-16
Knowledge cutoff
—
Types
InputTextImageVideo
OutputText
Reasoning
Supported
Tool use
Supported
Structured output
Supported
Attachments
Supported
Open weights
—
Provider pricing
Vercel AI Gateway
InTextImage
OutText
- Price
- $0.95 / $2.57
- Context
- 1M
- Status
- Stable
Kilo Gateway
InTextImageVideo
OutText
- Price
- $1.00 / $2.70
- Context
- 1M
- Status
- Stable
NanoGPT
InTextImageVideo
OutText
- Price
- $1.00 / $2.70
- Context
- 1M
- Status
- Stable
Novita AI
InTextImageVideo
OutText
- Price
- $1.00 / $2.70
- Context
- 1M
- Status
- Stable
OpenRouter
InTextImageVideo
OutText
- Price
- $1.00 / $2.70
- Context
- 1M
- Status
- Stable
AI/ML API
InTextImageVideo
OutText
- Price
- $1.38 / $3.71
- Context
- 1M
- Status
- Stable