Microsoft adds GPT-5.3 model choice to Copilot in 365 apps

2 Apr 2026

Microsoft adds GPT-5.3 Instant model option to Copilot in Microsoft 365 apps and Copilot Studio. Previously fixed to one model, users can now select for speed or task fit in workflows like email drafting and data analysis. Roadmap ID 558538 tracks rollout.

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