LLMO is a synonym for GEO: the discipline of improving a brand's presence in large language model outputs, from training data through retrieved sources.
Different teams use different names for the same emerging discipline — GEO, AEO, LLMO, AI SEO. LLMO emphasizes the mechanism: large language models learn brand associations from training data and refresh them through retrieval, so optimization targets both layers.
The training layer moves slowly (what the model "knows" about a category) while the retrieval layer moves weekly (what it reads before answering). Week-over-week rank movement on an AI visibility index mostly reflects the second layer.