Claude Opus 5.5 matches Fable 5.1 performance at 40% lower cost
Anthropic released Claude Opus 5.5 in general availability Sept. 22, 2026, matching Fable 5.1 on most work while cutting the cost to run it 40% versus Opus 5.
Claude Opus 5.5All tags
Anthropic released Claude Opus 5.5 in general availability Sept. 22, 2026, matching Fable 5.1 on most work while cutting the cost to run it 40% versus Opus 5.