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Code Attribution Mostly Found Length, Not Identity

Across 15 model-benchmark combinations, balanced accuracy stayed near chance and tracked solution length.

Published Updated Story ID: mp-2026-09-27-008
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Summary

Across 15 model-benchmark combinations, balanced accuracy stayed near chance and tracked solution length.

A study of model self-attribution found balanced accuracy between 49% and 58% across 15 model-benchmark combinations. Pairwise attribution scores correlated at r=0.93 with longer solutions, suggesting that style and verbosity were doing much of the work. After normalization, 10 of 12 tested conditions fell to chance and the remaining two continued to follow length, erasing the apparent self-preference in this setup.

Why it matters

Across 15 model-benchmark combinations, balanced accuracy stayed near chance and tracked solution length.

Limits and context

No additional limitation was separately recorded.

Key claims

  1. Across 15 model-benchmark combinations, balanced accuracy stayed near chance and tracked solution length.

    Evidence: source-2026-09-27-008

Sources

  1. arXiv preprint 2609.30048arXiv · primary research

Corrections

No corrections have been recorded for this story.