Anthropic's Claude Fable 5.2 is now on Vercel AI Gateway

Vercel added Anthropic's Claude Fable 5.2 to its AI Gateway, according to a company changelog. Vercel describes the model as built for open-ended technical work, with improvements over earlier Fable releases in coding, reasoning and vision, and the ability to run long, ambiguous tasks unattended or act as an orchestrator or advisor to other Claude models. Effort levels range from low to max, with high as the API default. Developers call it through the AI SDK, Chat Completions, Responses or Anthropic Messages APIs as anthropic/claude-fable-5.2, or from coding agents connected to the gateway. Fable 5.2 requires data retention: Anthropic does not support Zero Data Retention, prompts and completions are kept 30 days and are not used for training, and requests from ZDR-enabled teams return an error. Cybersecurity and biology classifiers are enabled, and a models array in providerOptions.gateway can fall back to other models when a request is declined.