Anthropic launched Claude Fable 5 in June 2026 as its first publicly available Mythos-class model, priced at $10 per million input tokens and $50 per million output tokens—double the rate of Opus 5 and matching OpenAI’s GPT-6 Astra. Temporary export-control suspensions in mid-June briefly halted access before restoration in July, while the September release of Fable 5.1 kept base output pricing unchanged but cut cache-read costs 75% to $0.25 per million, yielding 25–45% lower effective costs on typical workloads. Traders are watching for further caching optimizations, competitive price responses from OpenAI or Google, or new frontier releases that could pressure Anthropic to adjust the $50 output rate before year-end.