Incident with Copilot and Claude Sonnet 4

Resolved

On July 22nd, 2025, between 17:58 and 18:35 UTC, the Copilot service experienced degraded availability for Claude Sonnet 4 requests. 4.7% of Claude 4 requests failed during this time. No other models were impacted. The issue was caused by an upstream problem affecting our ability to serve requests.We mitigated by rerouting capacity and monitoring recovery. We are improving detection and mitigation to reduce future impact.

Investigating

We are experiencing degraded availability for the Claude Sonnet 4 model in Copilot Chat, VS Code and other Copilot products. This is due to an issue with an upstream model provider. We are working with them to resolve the issue.Other models are available and working as expected.

Investigating

We are investigating reports of degraded performance for Copilot