ARC Prize Verified

Claude Opus 5.5

Anthropic·Sep 22, 2026·5 reasoning variants

At high reasoning effort, Claude Opus 5.5 scores 98.5% on v1 Semi-Private and 93.3% on v2 Semi-Private.

ARC-AGI 2 leaderboard

Claude Opus 5.5

Verified scores

VariantARC-AGI-1ARC-AGI-2ARC-AGI-3
Max
97.5%
91.7%
XHigh
97.5%
92.5%
High
98.5%
93.3%
Medium
97.5%
87.5%
Low
88.5%
70.1%

Tasks & environments

Pass/fail per reasoning level across each benchmark.

ARC-AGI-2 Public Eval

120 tasks
Task
Max
XHigh
High
Medium
Low

ARC-AGI-1 Public Eval

400 tasks
Task
Max
XHigh
High
Medium
Low