Vercel AI Updates: June 17, 2026

1. GLM 5.2 Lands on Vercel AI Gateway with a 1M-Token Context Window

Vercel. GLM 5.2 is now available through the Vercel AI Gateway, accessible via the model identifier zai/glm-5.2 in the AI SDK. The model ships with a 1 million token context window, up from 200K in its predecessor, and is positioned for long-horizon engineering tasks where it maintains project-level context across a single task. Routing through the gateway keeps the usual unified API, cost tracking, and provider pricing transparency with no added platform fees. Source

2. Vercel Sandbox Runtime Extended to 24 Hours for Long-Lived Agents

Vercel. Vercel Sandbox can now run for up to 24 hours, up from the prior 5-hour limit. The company highlights long-lived agentic workflows alongside large-scale data processing and end-to-end testing pipelines as the primary motivation, giving autonomous agents the sustained execution time needed for extended tasks. Combined with persistent sandboxes that retain state across sessions, the change supports more sophisticated agent operations. Source

3. Workflow SDK Adds Inflight Cancellation for Agentic Steps

Vercel. The Workflow SDK 5 beta added support for the standard AbortController and AbortSignal APIs, letting developers cancel in-flight operations using the same interface fetch already uses. The addition enables timeout-based cancellation and race handling, such as stopping a slow step when a durable timeout wins a race, which is useful for agent-based systems that need to interrupt operations on external conditions or timing constraints. Source

4. Workflow SDK Now Supports TanStack Start

Vercel. The Workflow SDK now integrates with TanStack Start, letting developers write durable, resumable operations that survive restarts, sleep for days, and retry on failure directly within that framework. The durable execution model underpins long-running agentic workflows that need to persist across interruptions. Source