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Skip to main content Skip to footer Policy Commitments Learn News Try Claude Try Claude Try Claude Learn more about Claude EN Log in to Claude Log in to Claude Log in to Claude Download app Download app Download app Policy Commitments Learn News Try Claude Try Claude Try Claude Learn more about Claude EN Log in to Claude Log in to Claude Log in to Claude Download app Download app Download app :Claude: Haiku 5.5 The cheapest, fastest, and most capable small model we’ve ever released. Read more Read more Read more Latest releases Introducing Haiku 5.5 Designed for high-volume, cost-sensitive work. It’s our fastest, cheapest, and most capable small model to date. Date October 7, 2026 Category Announcements Details Haiku Read announcement Read announcement Read announcement Introducing Sonnet 5.5 A clear upgrade over Sonnet 5 that runs 30% faster and costs up to 30% less for most work.