Claude Fable 5.1 on Netlify AI Gateway and Agent Runners

What shipped

Netlify added Claude Fable 5.1 to its AI Gateway and Agent Runners on September 1, 2026, with zero configuration required.

What changed

You can now call the Anthropic SDK directly from Netlify Functions and target Fable 5.1 without managing API keys or authentication — the AI Gateway handles credentials, routing, and billing automatically. The same access applies to Agent Runners, Netlify's managed runtime for agent workloads. No dashboard setup, no key rotation, no env vars.

Why a builder cares

Fable 5.1 is Anthropic's latest agentic-coding model, and this removes the single most annoying part of wiring it into a Netlify deployment: key management. Write the Anthropic SDK call, deploy, done. Teams already on Netlify Functions can upgrade from Fable 5 to 5.1 by changing the model name only.