# How LMArena uses E2B

**230,000**: “we had over 50,000 users who started over 230,000 E2B sandboxes”

As published on [e2b.dev](https://e2b.dev/customers/how-lmarena-collaborated-with-e2b-to-build-llm-web-development-evals), February 2025. Captured by usedby on 2026-10-06.

- Company: [LMArena](https://www.usedby.ai/companies/lmarena.md)
- Tool: [E2B](https://www.usedby.ai/tools/e2b.md)
- Customer since (as the page says): Arena implemented E2B for WebDev Arena in November 2024.

## What the story says

LMArena runs the code generated by competing LLMs inside isolated E2B sandboxes for WebDev Arena, an open-source arena where two models each build a web app and users vote on the better one. The sandboxes let it execute code from multiple models side by side with isolation.

Summary written by usedby from the source page, in English. The figures are those of E2B and LMArena, not ours.

> Very quickly, we had over 50,000 users who started over 230,000 E2B sandboxes.

- **2 hours**: “It took 2 hours to get E2B up and running.”
- **50,000**: “the platform has run over 50,000 model comparisons”
- **~150ms**: “E2B sandboxes start in ~150ms”

> It took 2 hours to get E2B up and running.
>
> Aryan Vichare, Member of Technical Staff at LMArena

## What usedby checked

We compared the story with its live page on 2026-10-06.

- Checked: the figure 230,000 is printed word for word on the page, near the name of LMArena.
- Checked: the passage quoted above is copied word for word from the page, near the name of LMArena.
- Checked: each number in our summary is printed on the page.
- Checked: the publication date is read from the page’s own metadata, never guessed.
- Checked: LMArena uses E2B. Confirmed line. Latest check across sources: 2026-10-06.
- Not checked: the result itself. We quote it; we did not measure it.

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Source: https://www.usedby.ai/case-studies/lmarena-e2b · How we check: https://www.usedby.ai/methodology