Fact · Typing and writing speed
55.8percent
In the randomized GitHub Copilot experiment, the treated group completed the task 55.8 percent faster than the control group.
Checked against its source on October 16, 2026
In the source's own words
“the treated group completed the task 55.8% faster (95% confidence interval: 21-89%)”
The Impact of AI on Developer Productivity: Evidence from GitHub Copilot, Sida Peng et al., arXiv preprint, 2023, Abstract and Section 3.
Open the original- What it measures
- Recruited developers built an HTTP server in JavaScript and could use internet search and Stack Overflow.
- What it does not show
- One bounded coding task. It does not measure typing speed or writing quality.