Opus 5.5 tops Coding Agent Index at 66; cost/task up 21%
Artificial Analysis scores Claude Opus 5.5 at 66 on its Coding Agent Index at max effort in Claude Code—highest measured, six points above Opus 5—but estimated cost per task rose 21% to $13.04 from $10.79, as heavier token use outweighed Anthropic’s 20% price cut.
