Microsoft is pivoting back to its primary partner OpenAI with a day-one integration of GPT-5.6 model series to supercharge Word, Excel, and PowerPoint.

Microsoft will replace OpenAI and Anthropic models with its own AI in 365 Copilot. Anthropic's valuation hitting high $1.25T by December at 90.5% YES.

By offering flexible pricing tiers, specialized speed modes, and advanced multi-agent capabilities, OpenAI's new GPT-5.6 family is ready for enterprise AI deployment.