Claude Fable 5.1 now available on AI Gateway

Vercel has added Anthropic's new Claude Fable 5.1 model to its AI Gateway. This release is built to handle complex, multi-step projects such as in-depth research and agentic coding across entire codebases. If you use terminal-based tools like Claude Code or editors like Cursor, you can now connect the new model directly through your gateway setup.

Because the model comes with strict safety classifiers, Vercel noted that "some routine coding and debugging may still be refused." To keep your builds running smoothly, the gateway supports automatic fallbacks, routing any rejected prompts to other dependable models like Opus or Sonnet without breaking your flow.

For anyone building software with AI, this makes experimenting with top-tier reasoning models straightforward. You get stronger multi-step planning in your favorite coding tools while keeping a safety net in place when edge cases trigger model refusals.