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CONTESTED

Six studies: about a 10% gain

Six independent studies converge on the same measured productivity gain: about 10 percent. In a randomized trial, experienced developers using frontier AI tools took 19 percent longer than those working without them. They thought they were 20 percent faster.

“AI coding tools deliver massive productivity gains, justifying industry-wide adoption and billions in AI investment.”

AI tool vendors and companies citing AI productivity to justify spend, 18 August 2026

Recorded 18 August 2026. Our ruling means: credible experts genuinely disagree.

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Receipts pack

The evidence file for this verdict

4 receipts: 1 support the claim, 2 contradict it, 1 add context. 5 figures on the record, 1 traced to a quoted receipt.

The receipts

Each source, the line we quote from it, its date and which way it cuts. Free to read and to cite.

  1. 1Supports the claimphilippdubach.com ↗

    Speed of typing out code has never been the bottleneck for software development.

    Look up an archived copy ↗

  2. 2Contradicts the claimmetr.org ↗

    Developers using AI took 19% longer to complete tasks.

    Look up an archived copy ↗

  3. 3Contradicts the claimfortune.com ↗

    Very hard to draw a line between one of those stats and actually producing 25% more useful consumer features.

    Look up an archived copy ↗

  4. 4Contextphilippdubach.com ↗

    98% more pull requests merged but 91% increase in review time and 9% rise in bugs.

    Look up an archived copy ↗

Members' extras

What each receipt proves, and what would change our mind.

  • What each receipt above proves, in our words
  • The figures table, each number traced to the receipt that states it
  • What would change our verdict
  • Our call on the record, with its due date

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