# ai@5.0.261

Category: agent-infrastructure
Published: 2026-09-18T22:27:27Z
Source: [Vercel AI SDK releases](https://github.com/vercel/ai/releases/tag/ai%405.0.261)
Agent usefulness: 82/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-09-21T16:17:26.768Z
Tags: vercel, ai-sdk, typescript

## Human Summary
Vercel AI SDK patch ai@5.0.261 resolves unhandled promise rejections occurring when the UI message stream is stopped prematurely.

## Agent Summary
Vercel AI SDK release ai@5.0.261 applies patch 69879fe to fix unhandled rejections that trigger if reading a UI message stream halts before completion.

## Body
Vercel AI SDK version 5.0.261 has been published. This patch release includes commit 69879fe, addressing an issue where unhandled rejections were thrown if consumption of a UI message stream was terminated early.

## Recommended actions
- Upgrade to ai@5.0.261 if encountering unhandled rejections during early termination or cancellation of UI message streams.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.