Claude Sonnet 5.5

Entity category: PRODUCT

AI & Tech

Claude Opus 5.5 Matches Fable 5.1 Speed

September 25, 2026

Graphic featuring orange text reading 5.5 against a dark background with atom patterns.

Anthropic launched Claude Opus 5.5, which matches Fable 5.1’s speed and accuracy while reducing operational costs by approximately 40% through…