Incident resolved

Update timeline

1. identified May 18, 2026, 09:00 AM UTC

   We have identified elevated rate limiting from Google Vertex AI. Leading to this error on Glean - "Vertex AI is at capacity right now, so I can't get a response. Give it a few minutes and try again." Our engineering team continues to work with Google support on this issue. Symptom Affected customers may encounter transient errors (429/529) when making requests to the Claude Opus 4.6 model via Glean Chat or Agents. Workaround Affected customers may consider using alternative models.

2. investigating May 18, 2026, 02:01 PM UTC

   We are experiencing an issue with Vertex AI Online Prediction beginning on Sunday, 2026-05-17 21:10 PDT. Our engineering team continues to investigate the issue. We will provide an update by Monday, 2026-05-18 11:00 PDT with current details. We apologize to all who are affected by the disruption. Symptom Affected customers may encounter transient errors (429/529) when making requests to the Claude Opus 4.6 model Workaround Affected customers may consider using alternative models.

3. identified May 18, 2026, 02:02 PM UTC

   We have identified elevated rate limiting from Google Vertex AI. We are monitoring the issue and will share updates as service recovers.

4. resolved May 18, 2026, 03:39 PM UTC

   GCP has resolved the issue with Vertex AI Online Prediction for all affected users as of Monday, 2026-05-18 07:49 PDT. We thank you for your patience while we worked on resolving the issue.

5. resolved May 18, 2026, 04:04 PM UTC

   The incident has been resolved. Impact window: From May 18, 2026, 9:00 AM UTC to Monday, May 18, 2026, at 14:49 UTC, some users experienced elevated rate limiting from Google Vertex AI. Remediation: The issue with Vertex AI Online Prediction has been resolved for all affected users. We apologize for the disruption and appreciate your patience while we addressed this issue.