Anthropic has released Claude Fable 5, a state-of-the-art AI model with capabilities exceeding those of any previously available model. The model is available for general use, but with safeguards to prevent misuse, particularly in areas like cybersecurity. A more powerful version, Claude Mythos 5, is available to a limited group of trusted users. The models have shown exceptional performance in various tasks, including software engineering, knowledge work, and scientific research.