![(Updated) Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070]](https://mwpro.co.uk/wp-content/uploads/2025/06/pexels-alfonso-escalante-1319242-2533092-1024x683.webp "(Updated) Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070] 1")
(Updated) Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070]
Message ID: MC1194070 (Updated) Updated January 15, 2026: We have updated the timeline. Thank you for your patience. [Introduction] Microsoft 365 Copilot declarative agents are upgrading to the GPT-5.1 model, which uses an “auto” architecture. The orchestrator will automatically select the…
![(Updated) Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070]](https://mwpro.co.uk/wp-content/uploads/2025/06/harbour-city-3928590_1920-1024x683.webp "(Updated) Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070] 2")
![Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070]](https://mwpro.co.uk/wp-content/uploads/2024/08/pexels-anthony-derosa-39577-211816-1024x683.webp "Microsoft 365 Copilot: Declarative agents model upgrade to GPT-5.1 [MC1194070] 3")