Claude Opus 5.5

Anthropic ยท #1 of 136 on coding

92.2Coding index

Claude Opus 5.5, the benchmarks behind its index
Aider polyglot Not measured
SWE-bench Verified Not measured
LiveBench coding 96.3%
LMArena WebDev 1807 Elo
Benchmarks behind it Partial, 2 benchmarks
Output $/Mtok$20.00
Cost per solved taskNot computable
Context window1M