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StepFun: Step 5 Preview

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step-5-preview

Step 5 Preview is StepFun’s proprietary AI model, released Sep 18, 2026. Its strongest use case is coding, where it ranks in the 95th percentile of the models Model Beat tracks.

Context
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Input
— / 1M
Output
— / 1M
Released
Sep 18, 2026
Modalities
Strongest atCoding top 5%Reasoning & Knowledge top 7%

Benchmarks

Scores on standardized evaluations. Higher is better — and rank shows where Step 5 Preview lands among all models tracked on Model Beat.

94.0
Intelligence Index
Artificial Analysis
94th percentile of tracked models
95.0
Coding Index
Artificial Analysis
95th percentile of tracked models

Reasoning

1 evals
Humanity's Last Exam46.5%

Frontier of human expert knowledge

Coding

1 evals
SciCode58.9%

Scientific research coding

In the news

1

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Frequently asked questions

What is Step 5 Preview?

Step 5 Preview is an AI model, from StepFun, released Sep 18, 2026.

Who created Step 5 Preview?

Step 5 Preview is an AI model developed by StepFun, released Sep 18, 2026.

How does Step 5 Preview perform on benchmarks?

On standardized evaluations tracked by Epoch AI, Step 5 Preview scores 58.9% on SciCode, 46.5% on Humanity's Last Exam.

Is Step 5 Preview open source?

Step 5 Preview is a proprietary model (API access), available through its provider's API rather than as a downloadable open-weight model.

Benchmark data from Epoch AI (CC BY) and Artificial Analysis; pricing, specs & descriptions from OpenRouter. Data updated Sep 22, 2026.