AI SDK Introduces `firstChunkMs` Timeout for Fast Failure on Stalled Streams
lgrammel · x · 2026-07-23
The AI SDK recently introduced a highly anticipated timeout configuration parameter called firstChunkMs. This feature is designed to handle stalled streams by allowing developers to fail fast when a model returns headers quickly but never emits a content chunk.
Previously, such abnormal requests would consume the entire step timeout, causing significant resource waste and latency. The new mechanism drastically improves the stability of streaming workflows.
Related event: AI SDK Introduces Streaming Request Timeout(2 posts)→
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