Anthropic's Fable 5 Brings AI-Powered Game Creation to Casual Developers

Anthropic has released Claude Fable 5, making its Mythos-class model available to the public for the first time. The model includes built-in guardrails that restrict responses in high-risk domains including cybersecurity and biology. This release marks a significant step in bringing advanced AI capabilities to broader audiences while attempting to manage safety concerns.

Anthropic announced that Claude now writes 80% of its code, highlighting progress toward recursive self-improvement, where AI systems create the next generation without human involvement. The company simultaneously warned that this capability poses control risks, as unintended model behaviors could compound across generations and become harder to understand. The announcement reflects broader industry momentum, with OpenAI, Google DeepMind, and well-funded startups like Recursive Superintelligence and Inherent all pursuing similar capabilities.

Notion restored access to its service for Anthropic after a service disruption. The outage affected users of Notion's integration with Anthropic's AI capabilities. Notion's head of product expressed surprise at the social media attention the incident received.

xAI has engaged in a prolonged effort to access Anthropic's technology despite being cut off, according to six people involved with the work. The relationship took an unexpected turn when xAI began renting compute capacity to Anthropic, reversing what had been a competitive dynamic. The arrangement highlights tensions within the AI industry as companies balance competition with practical business needs.