I went down that “water use” rabbit hole a month ago and basically… it’s just a bunch of circular reporting that was based on some paper published in 2023[1]. For ChatGPT 3.5 they claimed “500ml for 10-50 responses”. In 2024, Washington Post published an article that took their claim and said “519 milliliters per email”[2] but didn’t source that from the original paper… that “shocking headline” took off and got widely circulated and cited directly, treating the WaPo calculation as if it were the original research finding. Then tech blogs and advocacy sites ran with it even harder, citing each other instead of any actual research[3].
If you look at the original paper they are quite upfront with the difficulty of estimating water use. It’s not public data—in fact it’s usually a closely held trade secret, plus it’s got all kinds of other issues like you don’t know where the training happened, when it happened, what the actual cooling efficiency was, etc. The researchers were pretty clear about these limitations in the actual paper.
Basically, it’s urban legend at this point. When OpenAI’s CEO later said ChatGPT uses ~0.3ml per query, that’s roughly 100x less than the viral claims.
If you look at the original paper they are quite upfront with the difficulty of estimating water use. It’s not public data—in fact it’s usually a closely held trade secret, plus it’s got all kinds of other issues like you don’t know where the training happened, when it happened, what the actual cooling efficiency was, etc. The researchers were pretty clear about these limitations in the actual paper.
Basically, it’s urban legend at this point. When OpenAI’s CEO later said ChatGPT uses ~0.3ml per query, that’s roughly 100x less than the viral claims.
[1] <https://arxiv.org/abs/2304.03271> [2] <https://www.washingtonpost.com/technology/2024/09/18/energy-...> [3] <https://www.seangoedecke.com/water-impact-of-ai>/