---
format: "aidr-story-markdown/v1"
id: "ba7844c57c1724cad1b633477de3ec90e12d4c18488f55d4e732b18a481c9b2c"
canonical_url: "https://aidr.today/ba7844c5?lang=en"
title: "Stepfun Step 5 Preview (LLM): On AA Pareto frontier"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-09-19T05:42:31.000Z"
category: "Models"
topics: ["anthropic","claude","multi-agent","open-source"]
source_urls: ["https://artificialanalysis.ai/models/step-5","https://news.ycombinator.com/item?id=49763660"]
summary: "Analysis of StepFun's Step 5 Preview and comparison to other AI models across key metrics including quality, price, performance (tokens per second & time to first token), context window & more."
---

# Stepfun Step 5 Preview \(LLM\): On AA Pareto frontier

> [Open the canonical story](<https://aidr.today/ba7844c5?lang=en>)

**Published:** 2026-09-19T05:42:31.000Z
**Category:** Models
**Topics:** anthropic, claude, multi\-agent, open\-source

## Summary

Analysis of StepFun's Step 5 Preview and comparison to other AI models across key metrics including quality, price, performance \(tokens per second &amp; time to first token\), context window &amp; more\.

## Sources

- [Story source](<https://artificialanalysis.ai/models/step-5>)
- [Discussion](<https://news.ycombinator.com/item?id=49763660>)