AI
Claude Sonnet 5.5 vs Opus 5.5: which model should you use?
Compare token prices, speed, coding and knowledge-work results, benchmark caveats, and failure costs to choose between Claude Sonnet 5.5 and Opus 5.5.
2026-10-04·Source Anthropic
This is the English edition. 한국어판 and 日本語版 are also available.