Microsoft is bringing OpenAI’s o1 reasoning model to all Copilot users this week. You won’t need to subscribe to a $20 monthly Copilot Pro or ChatGPT Plus plan to get it either, as Microsoft is making it free for all users of Copilot.

OpenAI's o1 reasoning model usually requires a costly subscription, but it's now free to all Microsoft Copilot users. This move follows a surge in popularity for Chinese AI app Deepseek and its free reasoning model earlier this week.

The defunct feature used to let users search for definitions and online articles about highlighted words and phrases.

Despite charging you more for its new, AI-inclusive plan, Microsoft is actually taking some features away. In an effort to thrust its Copilot AI tool on you, Microsoft Office apps will no longer offer Smart Lookup,