LMSYS Chatbot Arena
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Overview
Open source✓ Open Source
Use casecrowdsourced LLM ranking through anonymous side-by-side comparisons with Elo ratings
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Claims7
Avg confidence97%
Avg freshness99%
Last updatedUpdated yesterday
Trust distribution
100% unverified
Governance

LMSYS Chatbot Arena

product — also known as: Chatbot Arena

Crowdsourced platform for evaluating LLMs through anonymous randomized pairwise battles

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used by

ValueTrustConfidenceFreshnessSources
OpenAIUnverifiedHighFresh1

alternative to

ValueTrustConfidenceFreshnessSources
LMArenaUnverifiedHighFresh1

evaluates

ValueTrustConfidenceFreshnessSources
overall LLM quality via human preference judgmentsUnverifiedHighFresh1

open source

ValueTrustConfidenceFreshnessSources
trueUnverifiedHighFresh1

primary use case

ValueTrustConfidenceFreshnessSources
crowdsourced LLM ranking through anonymous side-by-side comparisons with Elo ratingsUnverifiedHighFresh1

first released

ValueTrustConfidenceFreshnessSources
2023UnverifiedHighFresh1

developed by

ValueTrustConfidenceFreshnessSources
LMSYS Org (UC Berkeley)UnverifiedHighFresh1

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Claim count: 7Last updated: 4/9/2026Edit history