Anthropic Joins AI Price War With Release of Fable 5.1

Details

Anthropic has released Fable 5.1, entering the ongoing price competition among frontier AI providers. The key change is a reduction in cache read pricing — a cost that matters significantly for production workloads that repeatedly query similar context windows, such as systems with long system prompts. Anthropic characterized Fable 5.1 as comparable in capability to Mythos 5.1, with different safety configurations rather than material performance differences. The release was timed on the same day OpenAI disclosed risk details about its upcoming Astra model, suggesting deliberate competitive counter-programming. According to The Information, Anthropic surpassed OpenAI on revenue this year — this release continues a pattern of competitive pricing moves that make Anthropic products more accessible to production workloads. Note: the source article is extremely brief and contains no specific pricing figures, no benchmark comparisons, and no detail on what the safeguard differences between Fable 5.1 and Mythos 5.1 involve. Specific cache read pricing changes should be verified against Anthropic's official pricing page.