Claude Fable 5 Breaks Records With a Smarter Approach to AI Safety

Claude Fable 5 establishes a new performance standard for AI coding tasks, but its true innovation lies in how it handles safety: using classifiers to delegate sensitive requests to Opus rather than refusing outright. This approach has practical implications for developers building production systems, as refused requests return a distinct status code and trigger fallback behaviors, making the model's safety boundaries a tangible part of the API contract rather than an abstract concern.