In One Sentence
LLMO (Large Language Model Optimization) refers to optimization tactics for getting your company cited by LLMs (ChatGPT / Claude / Gemini, etc.). It is roughly synonymous with GEO and is another label used especially in non-Japanese literature.
What does this look like in practice?
For example, when reading an overseas SEO blog, you might see something like:
"LLMO is the new SEO. Optimize your content for large language models like GPT-4 and Claude."