# Research · IT AI Recommendation Index

October 2026 Edition. Page: https://it-ai-index.com/research/

- [The same question, asked twice](https://it-ai-index.com/research/repeat-measurement/): Asked again with nothing changed, the models moved their own first choice 63% of the time, and the leader still held in 35 of 36 readings (12 categories at three buyer sizes).
- [What moved between editions](https://it-ai-index.com/research/movement/): Between the September 2026 Edition and the October 2026 Edition the leader changed in eighteen of sixty-seven categories, six of them by more than the noise floor of 11 points. Thirty-five of 556 changes in first-choice share clear the floor. Movement is read over the twelve models both editions asked; GPT-6 Luna, Muse Glimmer 30B joined this edition and are in the standing but not yet in the comparison.
- [The buyer's size changes the answer](https://it-ai-index.com/research/buyer-size/): In 112 of 136 categories the leader differs between small business, mid-market and enterprise buyers. The same category, three standings.
- [What the answers cite](https://it-ai-index.com/research/what-the-answers-cite/): Five of the fourteen models return a source list; across their 10,283 answers, 23% of the 139,660 citations point at a vendor's own site and 5% at a review site.