Vercel AI Updates: May 23, 2026

1. AI SDK gateway adds serviceTier option for flex and priority routing

Vercel. @ai-sdk/gateway@4.0.0-canary.91 adds a serviceTier: 'flex' | 'priority' option to GatewayProviderOptions, giving AI SDK callers a per-request lever to opt into cheaper background processing or faster premium routing without leaving the gateway surface. The flag mirrors the service-tier concept that OpenAI and a handful of other providers expose natively, but routes through Vercel’s gateway abstraction so the same option works across the multi-provider catalog the gateway already fans out to. The option is shipping on the 4.x canary line and will roll into stable as the gateway rev catches up. Source

2. OpenAI-compatible provider patches streaming crash on empty role delta chunks

Vercel. @ai-sdk/openai-compatible@2.0.48 lands a targeted fix that accepts empty-string role fields in streaming delta chunks coming back from OpenAI-compatible providers, eliminating a parse-time crash that broke streams from looser implementations. The patch cascades immediately into the downstream providers built on top of the compatibility layer, with coordinated bumps for @ai-sdk/xai@3.0.92, @ai-sdk/vercel@2.0.50, and @ai-sdk/togetherai@2.0.53 shipping on the same release train. Teams running Together, xAI, or third-party OpenAI-compatible endpoints through the AI SDK should pick up the patch to avoid intermittent stream failures. Source

3. AI SDK workflow canary keeps lockstep cadence with ai@7 canary line

Vercel. @ai-sdk/workflow@1.0.0-canary.69 shipped today alongside ai@7.0.0-canary.152, @ai-sdk/vue@4.0.0-canary.152, and @ai-sdk/svelte@5.0.0-canary.152, continuing the coordinated release cadence that has the workflow package moving in lockstep with the broader 4.x framework bindings on the road to the next AI SDK major. A parallel stable bump took ai@6.0.191 to pick up @ai-sdk/gateway@3.0.120, keeping the 3.x stable line current with gateway changes without forcing teams onto the canary track. The cadence continues to signal that workflow is being treated as a first-class primitive rather than an experimental side track. Source