“Two recent studies show nothing like “10x” improvement :”
Our reading, the sentence that was checked:
Two recent studies of generative AI coding tools show nothing like a 10x productivity improvement.
Assessment: Supported Evidence as of
Where and when Gary Marcus wrote it
Marcus on AI, Sorry, GenAI is NOT going to 10x computer programming, paragraph 8.
- Said
- Source observed
- live page, full text, public
- Evidence as of
- the cutoff for this assessment
- Assessment recorded
- assessment marcus-sorry-genai-is-not-going-to-10x-computer-19c660-a2
We recorded 7 claims from this post. See every claim from this post.
The wording above is the version this site observed on 2026-10-28. The source may have been edited after 2024-10-01. This page does not claim the wording was captured then.
What the claim commits to
- Kind
- Observation
- Deadline, as the speaker wrote it
- None stated. This site does not add one.
- Deadline state when assessed
- No horizon
- Deadline state on 2026-10-29
- No horizon (the release’s reference date)
Conditions
- two recent studies (qualifier, stated by the speaker)
From the speaker
- Two recent studies
- nothing like “10x” improvement
- One result with 800 programmers
- Another somewhat more positive study
Our interpretation
- The descriptions identify Uplevel's September 2024 study and the September 2024 Cui and colleagues paper on three workplace experiments.
- Assess what those studies reported by October 1, 2024. Their underlying experiments may predate publication, and no lower date bound is imposed.
- Tenfold means ten times baseline productivity. The claim being graded is the comparison with tenfold, not the accuracy of every adjacent description of the studies.
- The reference to two studies identifies the evidence; it is not a conditional forecast.
Counts as supported if: Both identified studies report productivity effects far below tenfold.
Counts as contradicted if: At least one identified study reports a credible productivity effect approaching or exceeding tenfold on its stated productivity measure.
Retrospective: these criteria were written after the outcome was public.
Current assessment
Was it true for the period described?
Outcome: Supported
The dated evidence matches what the claim committed to, under the criteria frozen before grading.
Scored on a plain reading. The speaker named no measure for this claim, so it was judged on the reading an informed reader would take, stated below under our interpretation. Both reviews had to find that reading fair.
- Evidence as of
- Deadline state when assessed
- No horizon
- Assessment recorded
- Policy version
- 2026-10-28.7
Rationale
Uplevel’s September 17, 2024 report found no significant improvement in pull-request cycle time or throughput with Copilot [e1]. The September 2024 workplace paper reported a pooled productivity increase of 26.08%, rather than a junior-only estimate [e2]. Both studies therefore reported effects far below tenfold on their respective measures [e1, e2].
Limitations
- These findings concern the two identified studies and do not establish effects for all coding tools, developers or later versions.
- The September manuscript’s exact release day is not established; September 30 is a conservative availability date, not a verified publication day.
Evidence (2 items)
Supports the claim: Uplevel,
Developers with Copilot did not see an increase in coding speed.
Why it matters here: The primary announcement identifies approximately 800 developers and reports no significant improvement in its efficiency measures. That is plainly below tenfold.
- Publisher
- Uplevel
- Kind of source
- Independent measurement
- Describes events of
- Public from
Supports the claim: Cui, Demirer, Jaffe, Musolff, Peng and Salz; September 2024 manuscript mirrored by Readwise,
increases soft- ware developer productivity by 26.08% (SE: 10.3%).
Why it matters here: The paper's pooled productivity estimate is far below tenfold. Its subgroup discussion reports junior gains of 21–40% and senior gains of 7–16%; 26.08% is the pooled estimate, not a junior-only estimate.
- Publisher
- Cui, Demirer, Jaffe, Musolff, Peng and Salz; September 2024 manuscript mirrored by Readwise
- Kind of source
- Preprint, not peer reviewed
- Describes events of
- Public from
Where it was said (1)
Said once in the sources this register covers.
: Marcus on AI, Sorry, GenAI is NOT going to 10x computer programming
Two recent studies show nothing like “10x” improvement :
- Where
- paragraph 8
- Published
- 2024-10-01
- Source observed
- , live page
- Access
- full text, public
History
Assessment versions
- Assessment marcus-sorry-genai-is-not-going-to-10x-computer-19c660-a2: Current. Outcome: Supported. Evidence as of 2026-10-28. Public date not recorded.
Recorded events
Assessment publishedBy this site
First assessment published after both reviews and the final-text check passed.
About assessment marcus-sorry-genai-is-not-going-to-10x-computer-19c660-a2.