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Coding sessions are longer and use more context. Claude Opus 5.5 is built with that in mind.
Model optimized for long coding sessions with lower costs
Anthropic released Claude Opus 5.5, a model update optimized for long-running coding sessions with higher context usage.
The model costs approximately 40% less to run than Opus 5 for typical token-billed workloads, with significant savings on cached token reads.
Opus 5.5 generates output more than 30% faster than Opus 5 and can complete open-ended tasks in fewer turns.
From the source
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.
claude.com
