Model specification · StepFun
Step 5 Preview
stepfun/step-5-preview
Step 5 Preview is StepFun's flagship model for agentic work, built on a sparse Mixture-of-Experts architecture (27B active / 600B total parameters). It performs strongly in software engineering and professional...
SpecificationsReported values
- Context window
- 1M
- Maximum output
- 64K
- Architecture
- text+image+video->text
- Tokenizer
- Other
- Knowledge cutoff
- —
- Moderated
- No
- Input modalities
- textimagevideo
- Output modalities
- text
Full pricingUSD where reported
| Price | Standard |
|---|---|
| Input | $1.00 / M |
| Output | $2.70 / M |
Benchmark indexesReported indexes
- Intelligence
- 28.5
- Coding
- —
- Agentic
- —
- Design Arena Elo
- —
Example workload costsStandard pricing only
| Workload | Input / output | Cache share | Estimated cost |
|---|---|---|---|
| Quick check | 10K / 1K × 1 | 0% | $0.013 |
| Long analysis | 100K / 4K × 1 | 50% | $0.066 |
| Workday | 20K / 2K × 1,000 | 30% | $20.00 |