Anthropic's Claude Fable 5: New Public AI Model Released

Anthropic has released a new public AI model called Claude Fable 5. This model is described as a "Mythos-class" AI and is now available for customers. What's interesting is that Anthropic previously said its Mythos AI was too powerful for public release. Claude Fable 5 is designed with specific safeguards to manage its capabilities. For some sensitive queries, it will defer to an older model. The company also details Claude Mythos 5, which is Fable 5 without many of the safeguards. Mythos 5 is only accessible to a small group of cybersecurity professionals. Both new models are priced at $10 per million input tokens and $50 per million output tokens. They are said to outperform previous models and competitors like GPT-5.5. Claude Fable 5 is available starting today, with tiered access for different subscription plans. This release marks a significant step in making powerful AI more widely accessible, while also highlighting the ongoing challenge of managing AI safety.