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← AI PulseSep 22, 2026

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Vercel AI SDK Adds Claude Opus 5.5 Support, Enhances File Handling, and Improves Harness Compatibility

The Vercel AI SDK has been updated to include support for Claude Opus 5.5 and to securely handle URL-backed language model file outputs, according to recent changelog entries.

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Read the source →Vercel AI SDK Changelog — Release @ai-sdk/workflow@2.0.42 · vercel/ai
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Vercel has released updates to its AI SDK, introducing support for Claude Opus 5.5 within the @ai-sdk/anthropic and @ai-sdk/gateway packages. These updates also include enhancements to file handling and improved compatibility for the SDK's harness component.

Key Points

  • The @ai-sdk/anthropic and @ai-sdk/gateway packages now support the Claude Opus 5.5 model ID.
  • Models like Claude Opus 5.5, Claude Fable 5, and Claude Fable 5.1 no longer receive thinking: { type: 'disabled' } or budget-based thinking settings, as the provider drops unsupported settings.
  • Models that reject forced tool use, including Claude Opus 5.5 and Claude Fable 5.1, will fall back to auto tool choice for required and named tool choices.
  • These models also fall back to native structured outputs when structuredOutputMode is enabled.
  • Telemetry support has been added to experimental_evaluate within the ai@7.0.111 release.
  • The ai@7.0.111 release fixes secure downloading of URL-backed language model file outputs, ensuring generated files expose actual base64 and byte content.
  • The ai@7.0.111 release ensures UI streams contain valid data URLs and propagates cancellation to batch file downloads.
  • The @ai-sdk/harness@1.0.121 release includes a fix to make bridge asset resolution compatible with Turbopack and Next.js 16.

Context

According to the Vercel AI SDK changelog, these updates are part of ongoing releases to the SDK. The changes address both new model integrations and improvements to existing functionalities, such as file handling and development environment compatibility.

Why It Matters

These updates provide developers using the Vercel AI SDK with access to a new model, Claude Opus 5.5, and improve the reliability and security of file operations within AI applications. The harness compatibility fix also streamlines development workflows for projects utilizing Turbopack and Next.js 16.

What To Do

  • Developers should review the @ai-sdk/anthropic and @ai-sdk/gateway documentation for details on integrating Claude Opus 5.5.
  • Note the changes in how thinking and tool use settings are handled for Claude Opus 5.5 and related models.
  • Test applications that rely on URL-backed language model file outputs to confirm secure and correct data handling.
  • If using Turbopack or Next.js 16, verify that the @ai-sdk/harness update resolves any bridge asset resolution issues.

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