Coding sessions are longer and use more context. Claude Opus 5.5 is built with that in mind.

We estimate Claude Opus 5.5 costs about 40% less to run than Opus 5 for typical workloads billed by token. For developers, exactly how those savings stack up matters. If you pay by the token, you will see the greatest cost difference for longer-running, higher context sessions–the exact type of Claude Code sessions that have become more prevalent in the last six months. This post will dive into the mechanics of what makes Opus 5.5 cost effective for how developers are coding today (and likely tomorrow).

Published by Claude Blog. This page is a short excerpt; the full text is theirs.