Anthropic built its most powerful AI model ever, slapped a premium price tag on it, and watched customers shrug. Claude Fable 5, the company’s flagship “Mythos-class” model launched on June 9, 2026, has captured just 6% of total tokens purchased in its first two months on the market.
For a model positioned as the pinnacle of Anthropic’s AI capabilities, that’s a remarkably thin slice of the pie. Even measured by revenue, where Fable 5’s higher prices should inflate its share, the model accounts for only 11.4% of earnings.
The price tag problem
Fable 5 costs $10 per million input tokens and $50 per million output tokens. Anthropic released Claude Opus 5 on July 24, barely six weeks after Fable 5’s debut, priced at exactly half: $5 per million input tokens and $25 per million output tokens.
Opus 5 matches or exceeds Fable 5’s performance across many benchmarks. When a model that costs 50% less delivers comparable results, the math isn’t complicated. Developers and enterprises ran the numbers and made the obvious call.
