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Vercel AI SDK Adds TypeSafe Provider for experimental_evaluate

The Vercel AI SDK has released version 3.0.0 of its @ai-sdk/typesafe-ai package, introducing a TypeSafe provider for experimental_evaluate that supports native question types and structured rubrics.

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Source · Sep 16, 2026, 6:39 PM · On Illumora · Sep 16, 2026, 6:43 PM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/typesafe-ai@3.0.0 · vercel/ai
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Vercel AI SDK announced the release of @ai-sdk/typesafe-ai@3.0.0 on September 16 at 18:39 UTC, according to a GitHub release. This update includes a TypeSafe provider for experimental_evaluate, designed to enhance evaluation capabilities within the SDK.

Key Points

  • The TypeSafe provider for experimental_evaluate is a major change in @ai-sdk/typesafe-ai@3.0.0.
  • It supports native Choice, Score, and Boolean questions within a single request.
  • The provider includes support for structured JSON rubrics.
  • It also handles probability distributions and confidence metadata.
  • Workflow serialization is a supported feature of the new provider.
  • The release updates dependencies for @ai-sdk/provider-utils@5.0.42 and @ai-sdk/provider@4.0.16.

Context

According to the Vercel AI SDK changelog, the TypeSafe provider for experimental_evaluate was added to enable more robust and structured evaluation workflows. This functionality allows developers to define evaluation criteria using native question types and JSON rubrics, streamlining the assessment of AI model outputs.

Why It Matters

This update provides builders with enhanced tools for evaluating AI model performance, offering structured methods for assessing responses and integrating evaluation results into development workflows. The inclusion of confidence metadata and probability distributions can aid in understanding model certainty and output variability.

What To Do

  • Review the @ai-sdk/typesafe-ai@3.0.0 release notes for detailed implementation guidance.
  • Test the TypeSafe provider with experimental_evaluate for native Choice, Score, and Boolean questions.
  • Experiment with structured JSON rubrics to define specific evaluation criteria.
  • Note the support for probability distributions and confidence metadata in evaluation results.

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