# Research · GTM AI Recommendation Index

September 2026 Edition. Page: https://gtm-ai-index.com/research/

- [The same question, asked twice](https://gtm-ai-index.com/research/repeat-measurement/): Asked again with nothing changed, the models moved their own first choice 66% of the time, and the leader still held in 15 of 20 categories.
- [The buyer's size changes the answer](https://gtm-ai-index.com/research/buyer-size/): In 68 of 73 categories the leader differs between small business, mid-market and enterprise buyers. The same category, three standings.
- [What the answers cite](https://gtm-ai-index.com/research/what-the-answers-cite/): Four of the twelve models return a source list; across their 1,503 answers, 33% of the 13,814 citations point at a vendor's own site and 5% at a review site.