Stepfun
Step 5 Preview
Tool callingStructured outputReasoningImage inputVideo input
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
- 1.0M
- Released
- 4w ago
- Input / 1M tokens
- $1.00
- Output / 1M tokens
- $2.70
- Cached input / 1M tokens
- $0.05
Sources:models.devOpenRouter
Benchmarks
DeepSWE is the primary coding benchmark where an exact model evaluation exists. Other sourced evaluations appear below; missing scores are not zero.
Not evaluated in DeepSWE 1.1 as of 2026-09-22. Results are only shown for exact model versions in the official dataset. Official leaderboard.
No benchmark results have been matched to this model yet.
Specifications
- Developer
- Stepfun
- Model family
- Step
- Type
- Language model
- Predecessor
- —
- Successor
- —
- Released
- September 16, 2026
- Model ID
stepfun/step-5-preview- Openness
- Closed
- License
- —
- Input modalities
- text, image, video
- Output modalities
- text
- Modality
- text+image+video->text
- Tokenizer
- Other
- Max output tokens
- 64K
- Hugging Face
- stepfun-ai/Step-5-Preview
- Source freshness
- Metadata synced Oct 8, 2026, 10:17 PM UTC
Additional source evidence
- Source model
- stepfun/step-5-preview
- Last updated
- 2026-09-20
- Model context
- 1M
- Maximum input
- 1M
- Model output limit
- 1M
- Open weights
- No
- File attachments
- Yes
- Reasoning
- Yes
- Tool calling
- Yes
- Structured output
- Yes
Complete source record (JSON)
{
"id": "stepfun/step-5-preview",
"name": "Step 5 Preview",
"description": "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",
"last_updated": "2026-09-20",
"attachment": true,
"reasoning": true,
"tool_call": true,
"structured_output": true,
"modalities": {
"input": [
"text",
"image",
"video"
],
"output": [
"text"
]
},
"limit": {
"context": 1000000,
"input": 1000000,
"output": 1000000
},
"release_date": "2026-09-16",
"open_weights": false
}Infrastructure
Provider availability
| Provider | Endpoint | Context | Input /M tokens | Output /M tokens | Cached input /M tokens | Cache write /M tokens | Uptime 1d | Data handling |
|---|---|---|---|---|---|---|---|---|
| deepinfra/fp8 | 1.0M | $1.00 | $2.70 | $0.05 | — | 88.74% | ZDR: YesTraining: Unknown Prompt logging: Unknown Retention: Unknown Checked 2026-10-15 | |
| stepfun/fp8 | 1M | $1.00 | $2.70 | $0.05 | — | 97.40% | ZDR: No |
Provider data:OpenRouter