Step 5 Preview
Parameters
600B (Estimated)
Context Length
1M
Modality
Multimodal
Architecture
Undisclosed
License
Proprietary
Release Date
8 Oct 2026
Knowledge Cutoff
-
API Pricing (per 1M)
Input: $1.00 · Output: $2.70
Evaluation Benchmarks
Rank
#67
| Benchmark | Score | Rank |
|---|---|---|
Coding | 0.86 | 7 |
Web Development | high 1568 | 33 |
Intelligence Index | 0.44 | 37 |
Reasoning | 0.84 | 41 |
Agent Arena | -2.03 | 43 |
Data Analysis | 0.64 | 56 |
General | 0.62 | 60 |
LiveBench Average | 0.62 | 60 |
General Text | 1448 | 70 |
Rankings
Overall Rank
#67
Coding Rank
#52
About Step 5 Preview
Step 5 Preview is StepFun's flagship multimodal agentic model built on a sparse Mixture-of-Experts architecture with 27B active and 600B total parameters. It is tailored for complex agentic workflows, software engineering, and professional reasoning tasks.
Technical Specifications
Architecture specifications are undisclosed for proprietary models.
About Step 5
The Step 5 model family developed by StepFun.
Other Step 5 Models
- No related models available