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Vercel AI Gateway with the AI SDK: Model Strings, Fallbacks and Observability

How a single 'provider/model' string gives you every major model, usage tracking and failover on Vercel.

MasterClass Buddy Editorial

Engineering editorial team · 6 min read ·

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What you will learn
  1. With the AI SDK, a plain 'provider/model' string routes through the gateway.
  2. One key and one bill cover many providers.
  3. Usage, latency and errors are visible per model.

The problem with one SDK per provider

Shipping AI features usually starts with one provider's SDK. Then you want a cheaper model for summaries, a faster one for autocomplete, and a backup during an outage, and suddenly you maintain three integrations.

The AI Gateway sits between your app and the providers. The AI SDK talks to it by default when you pass a model as a string, so switching models is editing that string.

In the rest of this story
  1. What the gateway adds
  2. Streaming a reply in a route handler
  3. Operating it well
1 code example · 6 min read in full
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MasterClass Buddy Editorial

Engineering editorial team. Contributing deep-dive engineering architectures, cloud paradigms, and system design insights to Master Class Buddy.