Cursor users must consent to data collection in order to use Fable 5 (cursor.com)

Anthropic has announced that its latest model, Claude Fable 5, designed for complex and autonomous tasks in coding, requires user consent for data collection through its Data Retention Policy when Privacy Mode is enabled. As a Mythos-class model, Fable 5 surpasses previous iterations and is particularly adept at managing long-running, asynchronous projects with fewer interruptions, making it a top performer on the CursorBench benchmark for real-world coding tasks. Priced at roughly double that of Claude Opus 4.8, it positions itself as an optimal choice for intricate projects requiring advanced reasoning and decision-making capabilities. The model’s introduction comes with enhanced privacy considerations. Users and teams must opt into the data retention terms, as Fable 5 will store user interactions for harm-prevention processes, though this data will not be used for model training or shared among customers. While Fable 5 is turned off by default for teams and enterprise accounts with Privacy Mode enabled, it offers significant capabilities, including multi-step task management, tool utilization for extensive problem-solving, and an advanced "thinking variant" for more deliberate reasoning. This development highlights ongoing efforts in the AI/ML space to balance model performance with user privacy and security.