Anthropic

Claude Sonnet 5.5 benchmark results

7 results on 6 benchmarks from 2 sources.

Closed Released: Sep 28, 2026 Updated Oct 22, 2026 API prices & specs →

Also listed as: claude-sonnet-5.5-xhigh · claude-sonnet-5.5-high · claude-sonnet-5-5_max · Claude Sonnet 5.5 (max) · claude-sonnet-5-5_xhigh · Claude Sonnet 5.5 (xhigh) · Sonnet 5.5 (xhigh)

All benchmark results

Benchmarks	Score	Rank	Setting	Source type	Date
LMArena Text	1476	32	Overall, style control on; 4838 votes; 95% CI 1467–1485“claude-sonnet-5.5-xhigh”	Official leaderboard	Oct 8, 2026
LMArena WebDev	1774	3	Overall; 2323 votes; 95% CI 1759–1789“claude-sonnet-5.5-xhigh”	Official leaderboard	Oct 8, 2026
LMArena WebDev	1715	6	Overall; 3984 votes; 95% CI 1704–1726“claude-sonnet-5.5-high”	Official leaderboard	Oct 8, 2026
LMArena Vision	1268	35	Overall, style control on; 1608 votes; 95% CI 1253–1284“claude-sonnet-5.5-xhigh”	Official leaderboard	Oct 2, 2026
GPQA Diamond	95.6%	3	Epoch AI run, accuracy; effort: max	Independent run	Sep 29, 2026
AIME (OTIS Mock AIME 2024–2025)	100.0%	1	Epoch AI run, OTIS Mock AIME 2024–2025; effort: max	Independent run	Sep 29, 2026
Humanity's Last Exam	46.1%	4	Compiled by Epoch AI; effort: xhigh	Third-party compilation via Epoch AI	Sep 28, 2026

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FAQ

Where do these Claude Sonnet 5.5 scores come from?

From Epoch AI Benchmarking Hub and LMArena leaderboard dataset. Each row links to the original leaderboard, dataset or report, and vendor-reported numbers are labelled.