Claude Fable 5, Anthropic’s flagship model launched on June 9, 2026, represents only 6% of tokens purchased and 11.4% of revenue in its first two months on the market. Anthropic released Opus 5 just six weeks later at exactly half the price, at $5 per million input tokens instead of $10, and $25 per million output tokens instead of $50. This cheaper model delivers comparable or superior performance across many benchmarks, leading developers and enterprises to overwhelmingly choose this alternative. The company frames this as intentional market segmentation rather than cannibalization, with Fable 5 designed for complex long-horizon projects. This dynamic raises questions about the economic viability of developing ultra-premium models if Fable 5’s revenue share remains in single digits.
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