this post was submitted on 15 Aug 2025
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The University of Rhode Island's AI lab estimates that GPT-5 averages just over 18 Wh per query, so putting all of ChatGPT's reported 2.5 billion requests a day through the model could see energy usage as high as 45 GWh.

A daily energy use of 45 GWh is enormous. A typical modern nuclear power plant produces between 1 and 1.6 GW of electricity per reactor per hour, so data centers running OpenAI's GPT-5 at 18 Wh per query could require the power equivalent of two to three nuclear power reactors, an amount that could be enough to power a small country.

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[–] nightwatch_admin@feddit.nl 10 points 5 days ago (1 children)

Of course there are comments doubting the accuracy, which by itself is valid, but they are merely doing it to defend AI. IMHO, even at a fifth of the estimates, we’re talking humongous amounts of power, all for a so-so search engine, half arsed chatbots and dubious nsfw images mostly. And let’s not forget: it may be inaccurate and estimates are TOO LOW. Now wouldn’t that be fun?

[–] simple@piefed.social 7 points 5 days ago (3 children)

but they are merely doing it to defend AI.

No they're not, you can agree the research is garbage without defending AI. It literally assumes everything. GPT5 could be using eight times the power. It could be using half the power. It could be using a quadrillion times the power. Nobody knows, because they keep it secret.

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[–] Dasus@lemmy.world 7 points 4 days ago (8 children)

that's a lot. remember to add "-noai" to your google searches.

[–] Ilovethebomb@sh.itjust.works 5 points 4 days ago (1 children)

I'm just going to ignore the AI recommendations, let them burn money.

[–] Dasus@lemmy.world 5 points 4 days ago* (last edited 4 days ago)

i don't judge you for that. honestly it matters fuck all at this point

[–] Opisek@lemmy.world 2 points 4 days ago* (last edited 3 days ago)

This is my weekly time to tell lemmings about Kagi, the search engine that does not shove LLM in your face (but still lets you use it when you explicitly want it) and that you pay for with your money, not your data.

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[–] Blackmist@feddit.uk 8 points 5 days ago

That's alright. When they've got a generation of people who can't even hold a conversation without it, let alone do a job, that price increase will drop that energy use pretty rapidly.

[–] RememberTheApollo_@lemmy.world 5 points 4 days ago (6 children)

Help me out here. What designates the “response” type? Someone asking it to make a picture? Write a 20 page paper? Code a small app?

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[–] DarkCloud@lemmy.world 8 points 5 days ago

This bubble needs to pop, the sooner the better.

[–] vegeta@lemmy.world 8 points 5 days ago
[–] Sam_Bass@lemmy.world 1 points 3 days ago (4 children)

And how many milliwatts does an actual brain use?

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[–] Valmond@lemmy.world 7 points 5 days ago (3 children)

40Wh or 18Wh which is it?

That's my old gaming PC running a game for 2min42sec-6minutes ... Roughly.

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[–] stevedice@sh.itjust.works 4 points 4 days ago (1 children)

The team measured GPT-5’s power consumption by combining two key factors: how long the model took to respond to a given request, and the estimated average power draw of the hardware [they believe is] running it.

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[–] Melonpoly@lemmy.world 6 points 5 days ago (3 children)

It takes less energy to dry a full load of clothes

A standard dryer is more like 2-5kWh for a load.. Far more than 40Wh.

[–] morto@piefed.social 7 points 4 days ago* (last edited 4 days ago) (2 children)

Maybe you're mixing Wh with kWh. 40Wh is not that much, but it's still a lot for a single request.

[–] Ilovethebomb@sh.itjust.works 5 points 4 days ago (1 children)

Roughly the capacity of a laptop battery, a huge amount of energy per request.

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[–] LodeMike@lemmy.today 6 points 5 days ago (3 children)

40 watt-hours? That's the energy usage of a very small laptop.

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[–] plyth@feddit.org 2 points 4 days ago* (last edited 4 days ago) (2 children)

That are 25 request per kWh. At 10 to 25cents per kWh that's 1cent per request. That doesn't seem to be too expensive.

[–] gens@programming.dev 3 points 4 days ago

Hmmm. Sure. But I find people don't understand how much one kWh really is. A 500W drill can twist your arm. Imagine yourself twisting someones arm with all you got for a whole hour. Or idk. Either way it's a lot of energy.

And then you think about how much more energy a car uses then a human does. And then you find out about hot water...

[–] MangoCats@feddit.it 2 points 4 days ago

Which is why they're giving everybody free access, for now.

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