StepFun
Available in Shortly AI
Step 5 Preview
Released September 20, 2026
Step 5 Preview is StepFun’s flagship AI model for agentic coding, professional knowledge work, and financial analysis. Built on a sparse Mixture-of-Experts architecture with 600B total parameters and 27B active per token, it combines a 1M-token context window with vision input. From building interactive applications and debugging code to conducting research and producing analytical reports, it supports complex workflows that require sustained reasoning, tool use, and iterative refinement.
- Context window
- 1M tokens
- Maximum output
- 1M tokens
- Input pricing
- $1.00/M
- Output pricing
- $2.70/M
Independent benchmark
LiveBench performance
Benchmark data from LiveBench 2.0, release 2026-10-25.
| Category | Score |
|---|---|
| Long Agentic | 19.400 |
| Reasoning | 83.800 |
| Coding | 85.600 |
| Browser Use | 24.800 |
| Data Analysis | 63.500 |
| Research | 72.800 |
| Design | 76.900 |
Benchmarks measure selected evaluation tasks and do not guarantee performance for every prompt or workflow.
FAQ
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