Code 2025
What Data from 20m Pull Requests Reveal About AI Transformation — Nick Arcolano, Jellyfish
Overview
This talk analyzes data from 20 million pull requests across 200,000 developers to reveal real-world trends in AI adoption and its impact on software engineering. It highlights that while interactive AI coding tools are seeing widespread adoption and significant productivity gains, fully autonomous agents are still in early stages. The data suggests that code architecture plays a crucial role in realizing AI-driven productivity benefits.
Who should watch
- AI Engineers and developers exploring AI tool adoption.
- Product Managers seeking to understand expected productivity gains.
- Engineering leaders evaluating the impact of AI transformation.
- Builders investigating the challenges and opportunities of AI in software development.
- Those questioning why AI transformation might not be delivering advertised results.
Key takeaways
- Adoption of interactive AI coding tools has surged, with median developer usage increasing from 22% to nearly 90% over the past year.
- Companies can expect approximately a doubling of PR throughput by moving from minimal to full adoption of AI coding tools.
- Cycle times for PRs have decreased by an average of 24% with full AI adoption.
- AI adoption is not currently showing significant negative impacts on code quality, with no statistically significant relationship found with bug ticket creation or PR reverts.
- Teams using AI disproportionately tackle existing bug tickets, leading to an increase in resolved bugs.
- PRs are becoming larger (18% increase in net lines of code) with AI adoption, primarily due to additions rather than deletions, and tend to affect fewer files.
- Fully autonomous coding agents are adopted by a smaller percentage of companies, with most usage focused on experimentation rather than production.
- Code architecture significantly influences AI productivity gains; centralized and balanced architectures show higher throughput increases (up to 4x) compared to distributed ones, where gains are minimal or even negative due to context challenges across multiple repositories.
Notable quotes
*Median company developers are using AI 22% of the time that they code. It's grown steadily since then, and today we're seeing median adoption rates close to 90%.*
*On average, a company should expect to double their PR throughput if they go from not using AI at all to 100% adoption of AI coding tools.*
*The average trend is a 24% decrease in cycle times as you go from 0% to 100% adoption of AI coding tools.*
Unofficial community note. Prefer the recording for nuance.