Step 5 Preview
by StepFun Step Plan (China) · listed Sep 2026RTV
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
Current rates USD per 1M tokens
Input—
Output—
Cache read—
Cache write—
Against the market
On the record
- Model id
step-5-preview- Context window
- 1M tokens
- Max output
- 66K tokens
- Input modalities
- text, image, video
- Output modalities
- text
- Reasoning
- yes
- Tool calls
- yes
- Open weights
- no
- Knowledge cutoff
- —
- Released
- 2026-09-16
- Last updated
- 2026-09-20
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