Anthropic Cut Cache Reads 75%. Opus 5 Still Undercuts It.
Anthropic cut Claude Fable 5.1 cache reads 75% to $0.25/MTok, half of Opus 5's rate on a model with twice the base input price. But Opus 5 stays cheaper until cache reads pass a third of your bill, and Anthropic's own savings ceiling of 45% falls short of the 50% crossover.
September 1, 2026 · 15 min read