Anthropic launches Claude Fable 5 with Mythos safeguards (opens in new tab)

Anthropic launched Claude Fable 5 on June 9 as its first generally available Mythos-class AI model, calling it the company’s most capable model released for broad use and citing strong performance in software engineering, knowledge work, vision, scientific research and long-running tasks. The model uses the same underlying Mythos-class technology as Claude Mythos 5, but Anthropic says Fable 5 routes some higher-risk requests to Claude Opus 4.8 instead of answering directly. Anthropic said the...