On 2026-05-23, ChatGPT, Gemini, and Google AI Mode each named a different electric cars brand as their #1 — a state of full engine divergence that is rare in the CITE Index.
- ChatGPT: Mahindra XEV 9e (51.0% SoV on that engine)
- Gemini: Tata Punch EV (65.3% SoV on that engine)
- Google AI Mode: Tata Nexon EV (65.3% SoV on that engine)
Why this matters
Engine divergence is a measurement of the fragmentation of the AI shelf. When all three engines agree on a winner, a single brand owns the category. When they disagree, the category is contested — and the brand that wins is the one whose citation pool reaches all three engines.
For AEO specialists: full divergence is the highest-stakes signal in the CITE Index. It tells you which engines you have not yet won — and which sources you need to be cited on to flip them.
— The CITE Index, 23 May 2026