Claude 5.5 Family Deep Dive: Three Models in Fifteen Days, Two Leaderboards in Disagreement
Anthropic shipped Opus 5.5, Sonnet 5.5, and Haiku 5.5 in fifteen days, on official claims of Fable 5.1-level work at 40% lower cost, 30% faster and 30% cheaper on the volume tier, and the fastest cheapest small model, all percentages without published price cards.
2026-10-128 min read