Some users may be unable to see GPT within the model selection options in Microsoft 365 Copilot chat

Title: Some users may be unable to see GPT within the model selection options in Microsoft 365 Copilot chat User impact: Users may be unable to see GPT within the model selection options in Copilot chat. Final status: The investigation is complete and we've determined that a service incident didn't actually occur. The expected behavior is that GPT models will not appear in the model selector if disabled in the admin center. However, there was a previous code issue that allowed for these models to still appear in the user interface (UI) even when disabled in the admin center. That code issue was addressed, resulting in this return to the expected behavior. Follow this link for details on how to disable or enable models through the admin center: https://learn.microsoft.com/en-us/microsoft-365/copilot/openai-subprocessor. This communication will expire in 24 hours. This is the final update for the event.

Title: Some users may be unable to see GPT within the model selection options in Microsoft 365 Copilot chat User impact: Users may be unable to see GPT within the model selection options in Copilot chat. More info: As a workaround, affected users can continue using Auto in Copilot chat, to automatically choose an available model. Current status: We’ve identified that a recent Copilot service update modified how model selection options respond to an organization’s settings for OpenAI models. We’re working to confirm whether this is the expected experience. Scope of impact: Some users attempting to access GPT within the model selection options in Copilot chat may be impacted. This information may be updated as our investigation continues. Start time: Monday, October 19, 2026, at 6:00 AM UTC Next update by: Monday, October 19, 2026, at 6:00 PM UTC

Title: Some users are unable to see GPT within the model selection options in Microsoft 365 Copilot chat User impact: Users are unable to see GPT within the model selection options in Copilot chat. More info: As a workaround, affected users can continue using Auto in Copilot chat, to automatically choose an available model. Current status: We’ve identified that the issue may be related to service information used to determine which models are displayed in Copilot chat. We’re reviewing recent changes and service logs to isolate the underlying cause and determine the appropriate mitigation. Scope of impact: Your organization is affected by this event, and some users attempting to access GPT within the model selection options in Copilot chat are impacted. This information may be updated as our investigation continues. Next update by: Monday, October 19, 2026, at 11:00 AM UTC

Title: Some users are unable to see GPT within the model selection options in Microsoft 365 Copilot chat User impact: Users are unable to see GPT within the model selection options in Copilot chat. More info: As a workaround, affected users can continue using Auto in Copilot chat, to automatically choose an available model. Current status: We’re reviewing service monitoring telemetry and logs collected from affected users to isolate the root cause of the missing model selection options and determine our next troubleshooting steps. Scope of impact: Your organization is affected by this event, and some users attempting to access GPT within the model selection options in Copilot chat are impacted. Next update by: Monday, October 19, 2026, at 9:00 AM UTC