Anthropic’s new Fable release is cheaper, less restrictive

Anthropic has released Fable and Mythos 5.1, advanced AI models that offer performance upgrades and reduced token costs. The Fable release also features changes to lessen false-positive restrictions from its safeguards. These new models have set records in benchmarks like Terminal-Bench 4.0 and Humanity’s Last Exam. Anthropic also shared three novel scientific findings generated by the models, including a custom GPU optimization and a high-resolution map of Venus.