As someone who writes about the AI industry relatively frequently for this site, there is one question that I find myself constantly asking and being asked in turn, in some form or another: What do you actually use large language models for?

Today, OpenAI’s Economic Research Team went a long way toward answering that question, on a population level, releasing a first-of-its-kind National Bureau of Economic Research working paper (in association with Harvard economist David Denning) detailing how people end up using ChatGPT across time and tasks. While other research has sought to estimate this kind of usage data using self-reported surveys, this is the first such paper with direct access to OpenAI’s internal user data. As such, it gives us an unprecedented direct window into reliable usage stats for what is still the most popular application of LLMs by far.

After digging through the dense 65-page paper, here are seven of the most interesting and/or surprising things we discovered about how people are using OpenAI today.

OpenAI is still growing at a rapid clip

We’ve known for a while that ChatGPT was popular, but this paper gives a direct look at just how big the LLM has been getting in recent months. Just measuring weekly active users on ChatGPT’s consumer plans (i.e. Free, Plus, and Pro tiers), ChatGPT passed 100 million users in early 2024, climbed past 400 million users early this year, and currently can boast over 700 million users, or “nearly 10% of the world’s adult population,” according to the company.

OpenAI admits its measurements might be slightly off thanks to double-counting some logged-out users across multiple individual devices, as well as some logged-in users who maintain multiple accounts with different email addresses. And other reporting suggests only a small minority of those users are paying for the privilege of using ChatGPT just yet. Still, the vast number of people who are at least curious about trying OpenAI’s LLM appears to still be on the steep upward part of its growth curve.

All those new users are also leading to significant increases in just how many messages OpenAI processes daily, which has gone up from about 451 million in June 2024 to over 2.6 billion in June 2025 (averaged over a week near the end of the month). To give that number some context, Google announced in March that it averages 14 billion searches per day, and that’s after decades as the undisputed leader in Internet search.

… but usage growth is plateauing among long-term users

In addition to measuring overall user and usage growth, OpenAI’s paper also breaks down total usage based on when its logged-in users first signed up for an account. These charts show just how much of ChatGPT’s recent growth is reliant on new user acquisition, rather than older users increasing their daily usage.

In terms of average daily message volume per individual long-term user, ChatGPT seems to have seen two distinct and sharp growth periods. The first runs roughly from September through December 2024, coinciding with the launch of the o1-preview and o1-mini models. Average per-user messaging on ChatGPT then largely plateaued until April, when the launch of the o3 and o4-mini models caused another significant usage increase through June.

Since June, though, per-user message rates for established ChatGPT users (those who signed up in the first quarter of 2025 or before) have been remarkably flat for three full months. The growth in overall usage during that last quarter has been entirely driven by newer users who have signed up since April, many of whom are still getting their feet wet with the LLM.

We’ll see if the recent tumultuous launch of the GPT-5 model leads to another significant increase in per-user message volume averages in the coming months. If it doesn’t, then we may be seeing at least a temporary ceiling on how much use established ChatGPT users get out of the service in an average day.

ChatGPT users are younger and were more male than the general population

While young people are generally more likely to embrace new technology, it’s striking just how much of ChatGPT’s user base is made up of our youngest demographic cohort. A full 46 percent of users who revealed their age in OpenAI’s study sample were between the ages of 18 and 25. Add in the doubtless significant number of people under 18 using ChatGPT (who weren’t included in the sample at all), and a decent majority of OpenAI’s users probably aren’t old enough to remember the 20th century firsthand.

OpenAI also estimated the likely gender split among a large sample of ChatGPT users by using Social Security data and the World Gender Name Registry‘s list of strongly masculine or feminine first names. When ChatGPT launched in late 2022, this analysis found roughly 80 percent of weekly active ChatGPT users were likely male. In late 2025, that ratio has flipped to a slight (52.4 percent) majority for likely female users.

People are using it for more than work

Despite all the talk about LLMs potentially revolutionizing the workplace, a significant majority of all ChatGPT use has nothing to do with business productivity, according to OpenAI. Non-work tasks (as identified by an LLM-based classifier) grew from about 53 percent of all ChatGPT messages in June of 2024 to 72.2 percent as of June 2025, according to the study.

Some of this might have to do with the exclusion of users in the Business, Enterprise, and Education subscription tiers from the data set. Still, the recent rise in non-work uses suggests that a lot of the newest ChatGPT users are doing so more for personal than for productivity reasons.

ChatGPT users need help with their writing

It’s not that surprising that a lot of people use a large language model to help them with generating written words. But it’s still striking the extent to which writing help is a major use of ChatGPT.

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