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IFAI

Claude Sonnet 5.5

AnthropicClosedReleased Sep 28, 2026

Rank on Intelligence, week by week

Its best rank each week
Aug 24Not on the board
Aug 31Not on the board
Sep 7Not on the board
Sep 14Not on the board
Sep 21Not on the board
Sep 28Not on the board
Oct 5#2
Oct 12#2
Oct 19#2
Oct 26#2
Nov 2#9
Nov 9#13

Scores by variant

Reasoning efforts and resolutions of the same model are ranked separately.

Intelligence · Intelligence Index
  • Claude Sonnet 5.5 (Max, Default Fallback)#1354.5
  • Claude Sonnet 5.5 (Xhigh, Default Fallback)#2449.9
  • Claude Sonnet 5.5 (High, Default Fallback)#3741.5
  • Claude Sonnet 5.5 (Medium, Default Fallback)#5730.8
  • Claude Sonnet 5.5 (Low, Default Fallback)#7325.6
Coding · WebDev arena
  • Claude Sonnet 5.5 (xHigh)#21,774
  • Claude Sonnet 5.5 (High)#81,713

In the news: Claude Sonnet 5.5

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