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The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

intrepidkarthi.com

11–20 of 115 posts

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#11
post #5

This study was shown to be flawed at the time; METR has retracted it. And it doesn't take into account current frontier models. AI makes you more productive. This is no longer up for debate. The energy you spend arguing last year's talking points is better spent knuckling down and learning the tools.

What tools? The ones that will be outmoded in 6 months, or the ones that will be banned in 6 months?

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#13
2025 is such old news that this just isn't relevant.

METR already redid the study at a later date and now finds a likely 18% speedup

"For the subset of the original developers who participated in the later study, we now estimate a speedup of -18% with a confidence interval between -38% and +9%" (note their use of - and + here could be slightly confusing but they do mean 18% faster per the post)

https://metr.org/blog/2026-02-24-uplift-update/

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#14
My two bosses are anti-AI.

Whenever I tell them about how awesome AI is, they come back with stories about how they used AI and it couldn't even do anything basic and what it did do had errors.

People will always create a world narrative that matches what they already believe.

Anti AI people are always quoting these "facts" about how AI reduces productivity even when developers feel it increases productivity - it reinforces their world view.

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#15
Generation got cheap. Verification got expensive.

That proves AI is capable of doing one part of the software engineering process. The 16 devs in the study trusted AI to write the code. Once we trust AI to do the verification as well we'll realise the gains we feel we're getting now. Essentially we're intentionally going slower on the second half because the trust is missing.

Alternatively, rather than trusting AI to do the validation, we could follow the vibe-coder approach by skipping the validation entirely, and trust that the generation stage is good enough not to need it. Historically that's come with some small downsides, like the code being a broken mess of security holes, but with time AI might fix that.

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#16

There was a study that people using the keyboard instead of the mouse felt they were working faster but in fact they were working slower. A perception thing. Users were more engaged when using a keyboard.

I'm convinced this is what causes people to feel productive with vim

Triggered by both of these comments.. interaction mode dictates a style of thinking. I have to use a mouse, I'm forced to use my eyes, which also means I probably have to use a massive screen. I have to pay attention to some hyperactive Intellisense-like feature, I'm forced to remove my attention from the problem.

It's like saying you're convinced people reporting they feel more productive in a mauve-coloured room are liars, or those that drive automatic vs manual. Maybe they just find muave a restful colour?

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#18
post #7

"19 August 2025" This may as well have been written in the stone ages, when we were banging AI rocks together. I just did a ~6 month project in ~2 weeks using a frontier model. I wouldn't even have attempted this kind work a year ago, with or without the AIs available at the time!

Personal or work? Used by anyone or for fun?

Used by Anthropic to sell tokens

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#19
post #5

This study was shown to be flawed at the time; METR has retracted it. And it doesn't take into account current frontier models. AI makes you more productive. This is no longer up for debate. The energy you spend arguing last year's talking points is better spent knuckling down and learning the tools.

Have they retracted it? My understanding was simply that they released results with more recent data, not that this study itself was flawed (and their website doesn't mention a retraction either)

Re: The gauge broke: devs felt 20% faster with AI, measured 19% slower (2025)

#20
post #15

Generation got cheap. Verification got expensive. That proves AI is capable of doing one part of the software engineering process. The 16 devs in the study trusted AI to write the code. Once we trust AI to do the verification as well we'll realise the gains we feel we're getting now. Essentially we're intentionally going slower on the second half because the trust is missing. Alternatively, rather than trusting AI to…

small downsides like security holes? Those aren't small. Neither is creating a codebase that's an inextensible mess that even LLMs begin to struggle with.

The reality is making good decisions and thinking about approaches take time. AI can absolutely make us faster at it but it's not magic and these speedups come with effort.

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