Incident with Copilot GPT-5.1-Codex

Update timeline

1. investigating Feb 20, 2026, 10:02 AM UTC

   We are investigating reports of degraded performance for Copilot

2. investigating Feb 20, 2026, 10:02 AM UTC

   We are experiencing degraded availability for the GPT 5.1 Codex 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.

3. investigating Feb 20, 2026, 10:15 AM UTC

   Copilot is experiencing degraded performance. We are continuing to investigate.

4. investigating Feb 20, 2026, 10:36 AM UTC

   We are still experiencing degraded availability for the GPT 5.1 Codex 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.

5. investigating Feb 20, 2026, 10:50 AM UTC

   Copilot is experiencing degraded performance. We are continuing to investigate.

6. investigating Feb 20, 2026, 11:17 AM UTC

   Copilot is experiencing degraded performance. We are continuing to investigate.

7. investigating Feb 20, 2026, 11:19 AM UTC

   The issues with our upstream model provider have been resolved, and GPT 5.1 Codex is once again available in Copilot Chat and across IDE integrations [VSCode, Visual Studio, JetBrains]. We will continue monitoring to ensure stability, but mitigation is complete.

8. resolved Feb 20, 2026, 11:41 AM UTC

   This incident has been resolved. Thank you for your patience and understanding as we addressed this issue. A detailed root cause analysis will be shared as soon as it is available.

9. resolved Feb 20, 2026, 11:44 AM UTC

   Copilot is operating normally.