Requests to Claude Sonnet 4.6 saw elevated errors on April 3, 2026
This was one of the earlier April examples of a model-specific Claude incident. It fits the broader pattern that early-month instability often sat at the model layer.
Published: Apr 3, 2026, 2:12 PM EDT
Updated: Apr 21, 2026, 8:40 AM EDT
Incident started: Apr 3, 2026, 2:12 PM EDT
Crowd spike noticed: Apr 3, 2026, 2:18 PM EDT
Resolved: Apr 3, 2026, 3:21 PM EDT
Affected surface: Claude Sonnet 4.6 requests
Official updates said requests to Claude Sonnet 4.6 were seeing elevated errors before the model incident was resolved later that day.
- The problem was concentrated in Sonnet 4.6 rather than every Claude feature at once.
- This early-April note strengthens the month-long pattern of model-specific instability.
- For API users and heavy automation workflows, incidents like this can feel every bit as disruptive as a broader site outage.
A reviewed note on the April 3, 2026 incident affecting requests to Claude Sonnet 4.6.
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: