Companies thinking of equipping personnel with AI-powered conversational assistants have more reason to check out Microsoft. Today, the company announced a substantial upgrade to its Copilot AI assistant for Microsoft 365 — the subscription cloud software service it offers containing Office apps such as Word, Excel, and PowerPoint, as well as Outlook and OneDrive storage.

“Sharing some exciting updates for our Copilot for Microsoft 365 users,” posted Jordi Ribas, Microsoft corporate vice president CVP, head of engineering and product for Copilot and Bing, on the social platform X. “Starting today, you get priority access to GPT-4 Turbo for faster, more comprehensive responses with both web and work data. We’re also removing chat limits and increasing file uploads.”

The move comes after Microsoft’s ally OpenAI recently moved to make its GPT-3.5 model freely available for unlimited usage to users without a sign-in, likely pressuring Microsoft and other AI providers and rivals to upgrade paid offerings such as Copilot in order to justify their cost.

It also follows Microsoft’s move to open its custom Copilot GPT Builder to all Copilot Pro subscribers earlier this month, further expanding the capabilities and offerings of its marquee AI assistant.