Anthropic Launches Claude Fable 5.2 and Mythos 5.2 AI Models

Anthropic has introduced two advanced artificial intelligence models, Claude Fable 5.2 and Claude Mythos 5.2, marking its first major model release since CEO Dario Amodei called for a slowdown in AI development. The launch comes as the company prepares for a potential initial public offering (IPO). According to Anthropic, the new models can generate responses up to 30 per cent faster and cost around 20 per cent less than their predecessors. They are priced at $8 per million input tokens and $40 per million output tokens. The company said both models offer significant improvements in coding, reasoning and visual understanding. During internal testing, they reportedly helped engineers complete complex software migrations, design electronic devices, make progress in robotics research and address challenging scientific problems, including two open questions in black hole physics.

Although both models share the same underlying technology, they differ in their safety restrictions and availability. Claude Fable 5.2 includes stronger safeguards against potentially dangerous cybersecurity and biological research applications and is available to a wider audience through Anthropic’s platforms, including Claude, Claude Code and its API. It is also accessible through Amazon Web Services, Google Cloud and Microsoft Azure. Claude Mythos 5.2, meanwhile, has fewer restrictions and is intended for vetted organisations involved in cybersecurity and biomedical research. Anthropic highlighted the models’ performance in software development, scientific research and robotics, including the use of more than 1,000 AI agents to build an operating system. However, Mythos 5.2 is not yet available to the general public. The company says both models are designed to handle complex technical projects requiring sustained reasoning and coordination among multiple AI agents.