Step 5 Preview
by StepFunChat
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
- Context
- 1M tokens
- Max output
- 65,536 tokens
- Parameters
- 604B total
- Released
- 2026-09-16
- Weights
- Open
stepfun/step-5-preview · also seen as step-5-preview-free, stepfun-ai/step-5-preview, deepinfra/stepfun-ai/Step-5-Preview, stepfun/step-5-preview-20261008
Specifications
Full facts as recorded, incl. what is unknown.
- Released
- 2026-09-16
- Weights
- Opennot gated
- Input
- Text, Image, Video
- Output
- Text
- Context window
- 1,000,000 max across endpoints
- Max output
- 65,536
- Providers
- 12 + 9 gateways, not counted as providers
- Epoch Capabilities Index
- not evaluated
- Direct price range
- $0.959–$1.375 in · $2.70–$3.71 out per 1M tokens · 9 of 12 providers have a comparable price
More details
- Last updated
- 2026-09-20
- Knowledge cutoff
- Weights link
- Hugging Face · stepfun-ai/Step-5-Preview
- Parameters
- 604B total
- Developer country
- China
Capabilities
Across all endpoints: supported if any endpoint supports it.
- Tool calling
- Parallel toolsunknown
- Structured output
- Reasoning
- Image input
- PDF input
- Audio input
- Audio outputunknown
- Video input
- Prompt caching
- Web searchunknown
- Computer useunknown
- System messagesunknown
- Assistant prefillunknown
- Temperature
- Streamingunknown
- Attachments
Endpoints
One row per provider and variant; gateways are listed separately.
Loading endpoints…
Price history
Atom feedNo change since 19 Oct 2026. The cheapest direct price has been $0.959 in / $2.74 out per 1M tokens at StepFun (China) on every data refresh since then.
Tracked from 19 Oct 2026. Headline-eligible direct prices only, so a price the sanity check flags never draws a spike. Series as JSON
Cost calculator
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Similarly priced models
Blended rate per 1M tokens, each at its own cheapest provider (10M input : 2M output mix).
| Model | Blended/1M | In/1M | Out/1M | Context | vs Step 5 Preview |
|---|---|---|---|---|---|
| Seed 2.0 ProByteDance Seed | $1.30 | $0.782 | $3.88 | 256K | +1% |
| MiniMax M2.5 highspeedMiniMax | $1.30 | $0.60 | $4.80 | 1M | +1% |
| Seed 2.0 CodeByteDance Seed | $1.30 | $0.782 | $3.89 | 262K | +1% |
| ERNIE 5.0Baidu | $1.26 | $0.84 | $3.37 | 128K | −2% cheaper |
| Gemini 3.6 FlashGoogle | $1.25 | $0.75 | $3.75 | 1.05M | −3% cheaper |
| Gemini 3.7 FlashGoogle | $1.25 | $0.75 | $3.75 | 1.05M | −3% cheaper |
| Gemini 3.8 FlashGoogle | $1.25 | $0.75 | $3.75 | 1.05M | −3% cheaper |
| Abliterated ModelAbliteration | $1.33 | $1.00 | $3.00 | 262K | +4% |
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