Anthropic's Claude Fable 5.2 is now available on AI Gateway, a unified API for calling models. Fable 5.2 improves upon previous models in coding, reasoning, and vision, enabling long, unattended tasks and acting as an orchestrator or advisor. It also communicates more clearly and generates output faster. Fable 5.2 requires data retention, but Anthropic does not support Zero Data Retention (ZDR) for this model. When ZDR is enabled, AI Gateway returns an error instead of serving the request. To work around this, use model fallbacks by adding a models array to providerOptions.gateway. This allows AI Gateway to try other models when the cybersecurity classifier declines a request.