Sign in
← AI PulseJul 24, 2026

Wire · news · Multi-source brief

Vercel AI SDK for Anthropic Adds Claude Opus 5, Fallbacks, and Mid-Conversation Tool Changes

The Vercel AI SDK for Anthropic, in versions @ai-sdk/anthropic@2.0.91 and @ai-sdk/anthropic@3.0.102, now supports the Claude Opus 5 model, a 'default' fallback mode for safety classifier refusals, and mid-conversation tool changes.

By Illumora Editorial

Source · Jul 24, 2026, 5:22 PM · On Illumora · Jul 24, 2026, 5:28 PM

Media from the primary source — shown here so you can stay on Illumora.

Synthesized from multiple allowlisted primaries on the same event. Lanes →

Brief drafted by Illumora’s editorial model from the linked primary source. Ops desk reviews flagged pieces. How we write →

Read the source →Vercel AI SDK Changelog — Release @ai-sdk/anthropic@2.0.91 · vercel/ai
Save

Vercel has updated its AI SDK for Anthropic, introducing new features and model support in releases @ai-sdk/anthropic@2.0.91 and @ai-sdk/anthropic@3.0.102. These updates include the integration of the Claude Opus 5 model, enhanced fallback mechanisms, and improved tool handling capabilities.

Key Points

  • The @ai-sdk/anthropic package now supports the Claude Opus 5 model ID.
  • Claude Opus 5 offers frontier-tier capabilities, including 128k output tokens.
  • Claude Opus 5 supports structured output, adaptive thinking, and xhigh effort.
  • A 'default' fallback mode routes safety classifier refusals to Anthropic's recommended fallback model.
  • This fallback mode automatically adds the server-side-fallback-2026-07-01 beta.
  • Mid-conversation tool changes are supported via the toolChanges system message provider option.
  • Mid-conversation tool changes emit tool_addition/tool_removal content blocks and enable the mid-conversation-tool-changes-2026-07-01 beta.

Context

According to the Vercel AI SDK Changelog, these updates were released on July 24 at 17:22 for version @ai-sdk/anthropic@2.0.91 and at 17:24 for version @ai-sdk/anthropic@3.0.102. The changes introduce new functionalities for developers working with Anthropic models through the Vercel AI SDK.

Why It Matters

These updates provide developers with access to a more capable model and enhanced control over conversation flow and safety handling. The addition of Claude Opus 5 and improved tool management can lead to more sophisticated and robust AI applications.

What To Do

  • Review the Vercel AI SDK documentation for the @ai-sdk/anthropic package.
  • Test the 'default' fallback mode to understand its behavior with safety classifier refusals.
  • Experiment with the toolChanges system message provider option for dynamic tool interactions.
  • Note the capabilities of Claude Opus 5 for applications requiring high output tokens or advanced reasoning.

Keep Exploring

/atlas/claude-family /techniques/system-user-separation /techniques/output-schema /studio?pack=foundation