Claude Fable 5 access restored on AI Gateway

Access to Anthropic's Claude Fable 5 model has been restored on Vercel's AI Gateway after the US government lifted export controls. The model now features updated safety classifiers, and Anthropic retains prompts and completions for 30 days to detect misuse patterns.

Access to Claude Fable 5, the Mythos-class model, has now been restored https://www.anthropic.com/news/redeploying-fable-5 on AI Gateway following the US Government's decision https://www.anthropic.com/news/redeploying-fable-5 to lift the export controls. Fable 5 https://vercel.com/ai-gateway/models/claude-fable-5 is the same model that was available between June 9 and June 12. What has changed is the safety classifiers, which are now updated and more robust. In the near term, some routine tasks such as coding and debugging may trigger safety classifiers. To ensure requests are still serviced when the safety classifiers are triggered, use model fallbacks https://vercel.com/docs/ai-gateway/models-and-providers/model-fallbacks . AI Gateway will try each model in models in the stated order if Anthropic refuses the request to Fable 5. To call Fable 5, use model name anthropic/claude-fable-5 : Model fallbacks work on every API format: for more information on how to configure these, see the docs https://vercel.com/docs/ai-gateway/models-and-providers/model-fallbacks . Anthropic does not support Zero Data Retention for the model, because some misuse patterns are only visible across cumulative requests, which real-time filters cannot catch on their own. Prompts and completions are retained for 30 days and are not used to train Claude. Read more in the data retention whitepaper https://trust.anthropic.com/resources?s=7ksqkied5hn0pocsj206m&name=%5Banthropic%5D-security-and-privacy-design-of-anthropic-data-retention-and-review .