New entriesSeptember 29, 2026Impact
Claude Sonnet 5.5 debuts at #4 on LMArena WebDev · React
Claude Sonnet 5.5 appeared on the LMArena WebDev · React leaderboard for the first time on Sep 29, 2026, placing #4 with 1726.
Why it matters
New entries near the top of LMArena WebDev · React move the React Web Apps race on AIModelRace.
The details
- 1726 from 778 votes; early ratings carry wide confidence intervals and often move as votes accumulate.
Models in this story
Provenance: LMArena leaderboard published Sep 29, 2026; ratings from blind pairwise votes. Generated automatically from the published data. Sources: LMArena WebDev · React leaderboard · LMArena leaderboard dataset (CC BY 4.0) See the race.