Copilot's GPT-5.1 model has degraded performance

Resolved

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.

Investigating

We are continuing to investigate issues with the GPT-5.1 model. We are also seeing an increase in failures for Copilot Code Reviews.

Investigating

We are continuing to investigate issues with the GPT-5.1 model with our model provider. Uses of other models are not impacted.

Investigating

Copilot is experiencing degraded performance when using the GPT-5.1 model. We are investigating the issue.

Investigating

We are investigating reports of degraded performance for Copilot