
Opus 5.5 leads the benchmarks, but the 40% cost cut is the real release note
🕒 Published on Zendoric: September 24, 2026 · 00:26
Anthropic shipped Claude Opus 5.5 on September 22, claiming Fable 5.1-level performance on most work at 40% less cost to run than Opus 5. The leaderboard wins are real but narrow; the price curve and an unusually candid footnote about safeguards are the parts worth reading twice.








































