Sonnet 4.6 had a prolonged error spike on April 8, 2026
This was a longer model-specific event. It matters because developers can experience a very real outage while the broader Claude site still appears partially functional.
Published: Apr 8, 2026, 2:23 AM EDT
Updated: Apr 21, 2026, 8:40 AM EDT
Incident started: Apr 8, 2026, 2:23 AM EDT
Crowd spike noticed: Apr 8, 2026, 3:06 AM EDT
Resolved: Apr 8, 2026, 5:33 AM EDT
Affected surface: Claude Sonnet 4.6 requests
Official updates said Sonnet 4.6 was exhibiting errors above baseline for several hours before the model incident was fully resolved.
- The incident lasted longer than many of the other model-only notes in this archive.
- It shows how a single unstable model can create real outage conditions for some developers without crashing every Claude surface.
- The multi-stage official updates suggest the fix path was more involved than the brief model blips elsewhere in the month.
A reviewed note on the April 8, 2026 Sonnet 4.6 incident where one model family stayed above baseline for several hours.
Review the methodology page for how crowd reports are deduplicated and the status lag explainer for how independent reports differ from provider updates.
If you want the broader archive context, go back to the Claude outage history page.
Related notes in the same incident category: