You have built your prompt list. You are ready to monitor how you show up in AI Search.
Now someone is asking you the question you were hoping to avoid: which AI platforms are actually worth tracking?
It is a reasonable question with an unreasonable number of wrong answers.
Track too few and you are blind. Track them all and you will burn your prompt budget on platforms where your audience simply does not exist.
There are ten LLMs worth considering for your AI search monitoring tool. Here is exactly how to think about them, ranked by priority, with no sentimentality and no mercy.
1. Google AI Overviews
2 billion monthly active users (reported).
This is the cathedral, and everything else is a roadside chapel. It sits on top of existing search intent, which means your audience is seeing AI answers before they see a single organic result. It belongs in every tracking programme, full stop, regardless of what your budget looks like.
2. ChatGPT
1 billion monthly active users (estimated).
The reigning monarch of the chatbot kingdom, though the growth curve has reportedly gone flat. A billion users doing longer-form research and comparison queries is still the kind of number that demands your respect and your tracking budget. Just know that memory, browsing, and plugins make it one of the harder surfaces to pin down via API alone.
3. Gemini
750 million monthly active users (reported).
The runner-up in the chatbot race, and growing fast. Google has stitched it into Search, Workspace, and Android like a man who intends to stay. For B2B audiences especially, this one has crossed the line from optional to mandatory.
4. Google AI Mode
100 million monthly active users (reported).
Small numbers today, seismic implications tomorrow. This is less a feature bolted onto Search and more a quiet rehearsal for replacing it entirely. Track it now, before it becomes the default and you are the last person in the room to notice.
5. Copilot
150 million monthly active paid users (reported).
Microsoft has embedded this thing into Windows, Edge, and every corner of the Microsoft 365 universe. Millions of enterprise users are encountering it before they have consciously chosen an AI assistant at all. For B2B brands operating anywhere near procurement workflows, this is not optional.
6. Grok
64 million monthly active users (estimated).
Elon Musk’s creature, wired directly into X and drinking from the firehose of real-time posts. The audience skews toward the news-obsessed, the politically wired, and the chronically online. Relevant if your brand operates in finance, media, or tech. Ignorable if it does not.
7. Perplexity
45 million monthly active users (reported).
The smallest crowd on this list with the sharpest elbows. These users arrive demanding cited, source-backed answers, which makes every citation here worth more than its weight in vanity metrics. If you are in B2B or any category where research matters, Perplexity citations are the ones you actually want to be counting.
8. Claude
18-30 million monthly active users (estimated).
Modest numbers, but do not let that fool you into complacency. The user base skews heavily toward developers, researchers, and knowledge workers, the kind of people whose opinions travel far beyond their own screens. If that is your audience, this one earns its place on your tracking list.
9. Meta AI
Unknown reach, but potentially massive.
The audience figure is unconfirmed, but the distribution footprint is not. WhatsApp, Instagram, Facebook, Messenger: four platforms with a combined user base that could dwarf everything else on this list without breaking a sweat. The problem is that current tools have little to no coverage here, and anyone selling you confident Meta AI visibility data right now is a liar or a fool.
10. DeepSeek
130-170 million monthly active users (estimated).
Predominantly China-based, which tells you most of what you need to know about its relevance for Western tracking programmes. File it under “monitor if you operate in Asia or your category has global narrative implications.” For everyone else, this one sits at the bottom of the pile and stays there.
The hierarchy is not complicated. Google AI Overviews and ChatGPT are the non-negotiables, the two platforms you track before you track anything else. Gemini, Google AI Mode, and Copilot form a credible second tier that most programmes should include without much debate.
After that, it gets situational. Perplexity punches well above its user numbers for high-intent research queries. Grok, Claude, Meta AI, and DeepSeek each have a specific type of programme they belong in, and a much larger number they do not.
Your prompt budget is finite. Spend it where your audience actually lives, and do not let anyone talk you into tracking ten platforms equally just because ten platforms exist.
