Copilot, Microsoft's AI assistant, appears to be struggling to match its competition in terms of popularity. The number of people using Copilot has remained around 20 million weekly users for the last year, according to tech newsletter Newcomer, while OpenAI's ChatGPT has hit as high as 400 million weekly users. The data was shared at an annual executive meeting in March by Microsoft's chief financial officer Amy Hood, Newcomer reports, and raise some concerns about the AI future Microsoft is pitching. Microsoft uses OpenAI's models to power Copilot, and the assistant offers similar features to ChatGPT, but they clearly don't draw the same interest from users. The company has also built Copilot into Windows 11, Microsoft 365 and the Edge browser, without apparently reaping the benefit of additional user growth.

It's little wonder that investors were clamoring to plow money into OpenAI. Alongside an announcement that the company had raised 6.6 billion in funding, OpenAI revealed that "every week, over 250 million people around the world use ChatGPT to enhance their work, creativity, and learning." That's a sharp rise since late August, when OpenAI said the chatbot had 200 million weekly users -- double the number it had last November. As of June, 350 million people were using OpenAI's tools each month, according to internal documents obtained by The New York Times. It's unclear how many people are paying for access versus those using the free tier.