We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers.
The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.
![Ribbit and Ragatha sit huddled on the floor
Ribbit, sadly: "I grew up in a cult."
Ragatha, excitedly: "Oh! I grew up with colts too!"
Ribbit, now annoyed: "Cult, dumb[CENSORED]."
Ragatha smiles and daydreams of a poorly drawn horse](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:v3nnr6uxg4mvnhydw635lhdt/bafkreibympn3vj4fxpame624zrk76fx32go2a4abe6efbi7pjthoks3lbu)
