Evidence Passport
Study: AI code rises but finished work does not
Top story 2 in the issue of 23 October 2026, in 38 AI Coding & Developer Tools.
Original source
Study: AI code rises but finished work does not
A Harvard study of 718 firms using Jellyfish data found AI assistants increase code volume, but reviews and other later steps stop it becoming more completed work.
Evidence
Evidence: Independent validation (evidence step 6 of 6)
Confirmed by a separate team or an external test: the strongest step.
The story in three lines
- Key finding
- Across 718 firms, AI coding tools raised code volume without a matching rise in completed work.
- Significance
- Economic: productivity gains stall at review and integration, not at writing code.
- Takeaway
- Teams should invest in review and testing capacity, not only in code-generation tools.
Later coverage in the journal
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