Microsoft 365 Copilot adds thinking and instant GPT models
Microsoft 365 Copilot rolls out GPT-5.4 Thinking for step-by-step reasoning on complex tasks and GPT-5.3 Instant for quick responses. Multi-model Researcher compares outputs from GPT, Claude side-by-side. Researcher Council preview builds consensus from multiple AIs. Breaks single-model limits in Office apps.
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