Anthropic established a consistent pricing pattern for its Mythos-class Fable models, with Claude Fable 5 launching June 9, 2026, and successor Fable 5.1 releasing September 1, 2026, both at $10 per million input tokens and $50 per million output tokens. This 5x output premium supports the tier’s long-horizon agentic coding and research capabilities, matching OpenAI’s top GPT-6 Astra rates while exceeding lower tiers such as Opus 5.5 ($4/$20). As of October 23, 2026, no Fable 5.2 or later version has been announced amid recent releases of Opus, Sonnet, and Haiku 5.5 models. Trader sentiment centers on whether Anthropic will retain this output-token structure for the next Fable debut or adjust it amid competitive pressure and platform expansions.