Anthropic brings Mythos to the masses with Claude Fable 5, its most powerful generally available model ever
Anthropic has launched two new AI models, Claude Fable 5 and Claude Mythos 5, enhancing its AI capabilities with Fable 5 being available to the general public and designed for broader enterprise use, while Mythos 5 is restricted to approved users for sensitive applications in cybersecurity and biology. Fable 5 outperforms previous models in software engineering and knowledge work, while Mythos 5 retains advanced capabilities but with tighter access controls to mitigate misuse risks.
For a professional tracking AI advancements, the launch of Anthropic's Claude Fable 5 and Mythos 5 offers a significant leap in autonomous coding capabilities. Notably, Fable 5 excels in software engineering tasks, achieving 80.3% on SWE-bench Pro, significantly outperforming GPT-5.5. This positions Fable 5 as a powerful tool for enterprises looking to automate and accelerate complex engineering tasks, such as codebase migrations and app prototyping, potentially transforming how AI agents handle large-scale development projects.