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METR trial finds early-2025 AI tools slowed experienced developers

A randomized study found experienced open-source developers took 19 percent longer with the tested AI tools on familiar repositories.

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CURRENT ASSESSMENT · REVISION 1
AWAY FROM DOOM38confidence 92/100

Why it moved the index

The controlled result constrained claims that contemporary systems had already surpassed experienced humans in complex, context-heavy software work.

Assessment history

  1. R1
    Away 38 · confidence 92

    Initial source-backed launch assessment

    11 Aug 2026

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  1. DoomBench assesses “METR trial finds early-2025 AI tools slowed experienced developers” as evidence moving away from doom, with magnitude 38 and confidence 92 out of 100 in the human resilience category.

  2. The DoomBench assessment of “METR trial finds early-2025 AI tools slowed experienced developers” is based on reporting from METR and records the editorial rationale, source quality, attribution, and revision history.

  3. DoomBench summarizes “METR trial finds early-2025 AI tools slowed experienced developers” as follows: A randomized study found experienced open-source developers took 19 percent longer with the tested AI tools on familiar repositories.

    https://www.doombench.com/news/metr-finds-ai-slowed-experienced-developers