Sonnet 5.5 arrives: near-Opus coding quality at a fraction of the cost
gethackteam · x · 2026-09-29
Sonnet 5.5 is out and reportedly gets remarkably close to Opus 5.5 on most coding and agentic work, at a fraction of the cost and noticeably faster. Opus remains the pick for gnarly long-horizon problems, but Sonnet 5.5 will be hard to beat everywhere else.
Related event: Anthropic Launches Claude Sonnet 5.5: Over 30% Faster, Up to 30% Cheaper(58 posts)→
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