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← AI PulseAug 7, 2026

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Vercel AI SDK Adds Grok Build Harness and Adaptive Video Aspect Ratio

The Vercel AI SDK has introduced a Grok Build harness and enabled an 'adaptive' aspect ratio option for video generation, addressing how some video models handle output dimensions.

By Illumora Editorial

Source · Aug 7, 2026, 11:36 PM · On Illumora · Aug 7, 2026, 11:48 PM

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/workflow-harness@1.0.64 · vercel/ai
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The Vercel AI SDK has released updates, including the addition of a Grok Build harness and new functionality for video generation. These changes were published in the @ai-sdk/workflow-harness@1.0.64 and @ai-sdk/xai@4.0.33 releases.

Key Points

  • A Grok Build harness has been added to the Vercel AI SDK, built on top of an ACP adapter.
  • The ToolLoopAgent now respects timeouts configured in agent settings.
  • The generateVideo function now supports an aspectRatio: 'adaptive' option.
  • This adaptive aspect ratio is available on VideoModelV3CallOptions, VideoModelV4CallOptions, and experimental_generateVideo.
  • Some video models, such as BytePlus Seedance 2.5, derive output ratios from input and reject explicit width:height values for tasks like first-frame, first-and-last-frame, editing, and extension.

Context

According to the Vercel AI SDK Changelog, these updates aim to enhance the SDK's capabilities for integrating with different models and managing video generation parameters. The introduction of the Grok Build harness expands the range of supported models, while the adaptive aspect ratio addresses specific requirements of certain video generation models.

Why It Matters

These updates provide builders with more flexibility in integrating with diverse AI models, particularly Grok, and managing video output. The adaptive aspect ratio feature helps developers work around constraints imposed by video models that do not accept fixed dimensions, potentially streamlining video generation workflows.

What To Do

  • Review the Vercel AI SDK documentation for details on the Grok Build harness.
  • Test the aspectRatio: 'adaptive' option when working with video models that derive output ratios from input.
  • Note the updated VideoModelV3CallOptions, VideoModelV4CallOptions, and experimental_generateVideo for video generation tasks.
  • Check agent settings for ToolLoopAgent timeout configurations.

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