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Vector Store API calls returning 504s, 503s, and generally being slow

OpenAI Developer Community May 29, 2026
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Hey @Con, that can definitely be frustrating.

Since you've already tried a few approaches, one workaround that has helped others is treating the update as a migration rather than modifying the existing vector store:

  • Create a new vector store for the updated resource set
  • Add files in batches to reduce write pressure during ingestion
  • Wait until ingestion is fully complete
  • Run a small smoke test against the new store
  • Update the assistant to use the new vector store ID
  • Keep the previous vector store temporarily as a rollback option
  • Delete the old vector store only after the new one is confirmed stable

This isn't ideal, but it can help avoid issues during large updates or re-indexing operations.

Props to @S_z too

Avinash

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