Hacker News users question Claude model performance after Fable 5 update

A Hacker News thread is questioning the status of Claude AI models after a recent update. The update in question is referred to as Fable 5. Participants wonder whether the update has introduced bugs or performance regressions. Claude models are developed by Anthropic and are used for various AI tasks. The discussion notes observed issues but lacks official confirmation. Community members compare behavior before and after the Fable 5 rollout. Some suggest the problems may be temporary or configuration‑related. Anthropic has not yet responded, and users are watching for further clarification.