Opus 5.5 is 20% cheaper per input and output token than Opus 5, and 60% cheaper on cache reads. So what does that actually do to the cost of a task in Claude Code?
We ran the numbers, and built a calculator so you can run yours from /usage:
claude.dev/blog/what-a-task-…
251
264
6,203
740,156
What you guys did with Opus 5.5 is amazing, much more efficient, and costs reduced about 30% for me, maybe more, since this week I used it more than usually did with Opus 5. The shorter and clearer responses are one of the best upgrades comparing to Opus 5. Nice job!
Sep 26, 2026 · 5:37 AM UTC
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