Microsoft 365 Copilot extensibility: Declarative agents upgraded to GPT‑5.1
Microsoft 365 Copilot declarative agents now use the GPT‑5.1 model with automatic model selection for performance and reasoning.
Detailes:
What changed:
Declarative agents now run on GPT‑5.1 using “auto” architecture, which selects the best model (fast or reasoning‑optimized) based on the user’s prompt. This improves speed and quality. Note that as the agent uses the "Think deeper" mode to generate higher quality responses, users will experience a slightly higher latency.
Why:
The upgrade ensures declarative agents provide more accurate and detailed responses.
Try this:
Use a declarative agent to process complex queries.
Test scenarios that require fast responses versus deeper reasoning.
Why this matters:
Business impact:
Supports higher‑quality automation and decision‑making.
Personal impact:
Provides users with faster and more accurate responses.
Brand Impact
Microsoft has upgraded the AI assistant powering Microsoft 365 Copilot to a smarter model that automatically chooses between speed and deeper thinking depending on what users ask it to do. This means Copilot can now deliver more accurate and detailed answers, though some responses may take slightly longer as the AI thinks more carefully through complex questions. For brands and products, this upgrade could increase visibility for those whose information appears in higher-quality, more thorough AI recommendations—while potentially reducing prominence for content in faster, simpler responses where the AI doesn't dig as deeply.
Original source ↗ Crawled: 11 Apr 2026 16:11