Study: ChatGPT raised the bar on Stack Overflow, not killed it
Two years of data shows questions got harder and answers longer.
The paper 'Stack Overflow Is Not Dead Yet: Crowd Answers Still Matter' (arXiv, 2025/2026) by Denis Helic and Tiago Santos examines the impact of ChatGPT on Stack Overflow's user-generated content. Using two years of data and multiple causal regression models, the authors confirm an acceleration in the decline of user contributions after ChatGPT's launch in November 2022. However, they found a significant positive effect on the length and difficulty of questions, the length of answers, and the amount of code included. Across programming languages, users now post more complex and challenging queries, outsourcing simpler ones to AI.
This suggests ChatGPT handles easy questions, while Stack Overflow remains the go-to for nuanced, hard problems. The platform's community still matters for high-value crowd-sourced answers. For operators, actionable insights include focusing on retaining expert contributors and leveraging the shift toward deeper technical discussions. The study provides evidence that AI and human platforms can coexist, with the bar for crowd contributions rising rather than disappearing.
- Two years of Stack Overflow data (post-ChatGPT) analyzed with causal regression models.
- User contributions declined faster, but question and answer length increased significantly.
- Question difficulty and code length rose across programming languages, indicating a shift toward complex queries.
Why It Matters
AI handles easy coding questions, making human-expert platforms like Stack Overflow vital for hard problems.