StepFun
Step 5 Preview
CTX1.02M
Preview
83Quality
Reasoning · Vision · Tools
TextImageVideoInput$1/M
TextOutput$2.70/M
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
PaidProprietary1006/1040
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StepFunTextUncommonPreview
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
step-5-preview- Type
- Text
- Quality
- 83 · Top 17% on the LMArena Text
- Context window
- 1,024,000 tokens
- Max output
- 65,536 tokens
- Input price
- $1.00 / 1M tokens
- Output price
- $2.70 / 1M tokens
- Cache read
- $0.05 / 1M tokens
- Cache write
- —
- Parameters
- 604B (604,339,504,832)
- Downloads
- 1.2K in the last 30 days
- Likes
- 100
- Access to weights
- Open download
- Released
- Sep 16, 2026
- Knowledge cutoff
- —
- Takes in
- Text, Image, Video
- Puts out
- Text
- Reasoning
- Yes
- Tool calling
- Yes
- Structured output
- Yes
- File attachments
- Yes
- Access
- Paid
- License
- Proprietary
- Rarity
- Uncommon
- Set number
- 1006/1040
Open StepFun docsWeights on Hugging FaceQuality 83Where to run it 17Evolution 3/3Meet its creatureBattle Nova 2 Lite
Weights aren’t public. Use is governed by StepFun’s terms. Specs from models.dev, downloads from Hugging Face, last changed Oct 18, 2026. Official source: platform.stepfun.ai.