Anthropic’s Claude Fable 5 launched in June 2026 as the first widely available Mythos-class model with a $10 per million input and $50 per million output token price, establishing a new premium tier double that of Opus 4.8. Fable 5.1 followed in September at identical rates while adding improved caching and benchmark gains in coding and agentic tasks. Newer Claude 5.5 family releases, including Opus 5.5 at $4/$20, now match much of Fable’s performance at substantially lower cost, shifting competitive pressure. No Fable 5.2 has been announced as of early November 2026, leaving open whether a successor would retain, adjust, or debut altered output pricing amid ongoing model family expansions and external evaluations. Traders should watch Anthropic’s next flagship cadence and any reported capability thresholds that could justify a fresh price point.