LLMs and AI agents: the difference (and why it matters for your visibility)

Lately it has become fashionable to say that ChatGPT, Gemini or Perplexity are "old", made obsolete by AI agents. It's a catchy image but a misleading one - a bit like telling a tennis player their racket is made of wood because a newer model exists. The truth is more nuanced, and understanding it is the serious way to work on your visibility. Let's look at the real difference between assistants and agents, without the jargon.

The difference in one sentence

An AI assistant (an LLM like ChatGPT, Gemini, Claude or Perplexity) answers: you ask a question, it builds a response. An AI agent acts: you give it a goal, and it takes a series of steps to reach it - searching, comparing, deciding, sometimes performing actions on your behalf.

It sounds like a nuance, but it's a difference in kind. The assistant is a conversational tool: the dialogue begins and ends with you. The agent is a system that operates autonomously to complete a task, and it can use the assistants themselves as one of its tools.

A concrete example

Imagine you want to find an accountant for your business.

With an AI assistant you type: "who are the best accountants for freelancers in my area?". ChatGPT gives you an answer - some names, a few criteria, maybe some sources. Then it's up to you to read, evaluate, get in touch. The decision and the action stay with you.

With an AI agent you say: "find me an accountant for my business, compare three options and book a call with the best one". The agent searches, reads the websites, compares services and reviews, perhaps fills in a contact form and schedules the appointment. You step in only at the end, or to approve.

See the difference? In the first case the AI helps you decide. In the second, it decides and acts for you. But - and this is the crucial point - in both cases someone has to "see" the accountant first. Both the assistant and the agent need to find you, understand who you are, and consider you relevant. If the AI doesn't know you or represents you poorly, you're cut out in both scenarios.

Why conversational search still matters today

This is where the misconception many competitors ride on comes in. Agents are talked about as if they were already how people search for professionals and services. They're not, not yet. Today, in everyday reality, when someone looks for a provider they do it through conversational assistants. They open ChatGPT, ask Perplexity, use Google AI Mode. That's where the first impression forms, that's where reputation is decided.

Agents operating in full autonomy to choose providers are still in their early days for the average user. They're coming, and they will arrive - but anyone telling you today "don't waste time with ChatGPT, only agents matter now" is describing a future as if it were the present. It's a strategic mistake: it would mean ignoring exactly the channel where your clients are looking for you right now.

Assistants and agents, side by side

To fix the ideas, here are the main differences placed next to each other.

What it means for anyone who wants to be found

If you're a professional, a consultant or a small business, a clear two-step strategy follows from all this.

Now: cover the assistants

This is where your clients look for you today. You need to make sure ChatGPT, Gemini, Perplexity and Google AI Mode find you, understand you and represent you correctly. That means having a consistent identity across multiple sources, citable content, structured data in order, and ongoing monitoring of what AI says about you. It's not a one-off activity: AI answers change, and it needs to be followed month by month.

In parallel: prepare the ground for agents

The good news is you don't have to do two different jobs. The signals that make a site readable and trustworthy for an assistant are the same ones an agent will use tomorrow to decide: clean structured data, consistent sources, an llms.txt file that clearly explains who you are and what you offer, established reputation. Whoever builds well for today's LLMs is already ready for tomorrow's agentic world.

The substance, beyond the slogan

Back to the wooden racket: the competitors' metaphor confuses an "old" tool with a "different" tool. AI assistants are not an outdated version of agents. They're a different thing, doing a different job, and today they're exactly where people's search happens. Whoever understands this distinction - instead of riding the slogan - shows they really know how AI works, and that they handle both the present and the future.

This is the position from which it's worth working on your visibility: feet in the conversational present, eyes already on the agentic future. No shortcuts, and no selling tomorrow as if it were already today.