Variable fallbackConst

Creates a middleware that falls back to a different model on specific error statuses.

const { text } = await ai.generate({
  model: googleAI.model('gemini-2.5-pro'),
  prompt: 'You are a helpful AI assistant named Walt, say hello',
  use: [
    fallback({
      models: [googleAI.model('gemini-2.5-flash')],
      statuses: ['RESOURCE_EXHAUSTED'],
    }),
  ],
});
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