Which AI assistant to pick: ChatGPT, Claude, Gemini — and what to start with

Why you should care: picking an assistant is the one decision that decides whether AI becomes a habit or a tab you opened once. And it is a small decision — twenty minutes, no installation, no payment to start.

You don’t need the “best” AI. You need one assistant that you actually talk to every day — and picking one takes about twenty minutes. This article is what those twenty minutes look like.

Three words before we start

• Account — your personal login for a website: usually an email address and a password. Creating one is free and takes about two minutes. It is how the assistant remembers your chats on any device.
• Assistant — the app or website you talk to (ChatGPT, Claude, Gemini). Inside it works a model: the program that actually writes the answers. Same idea as a car and its engine.
• Free plan — the version you can use without paying. It usually comes with limits: a certain number of messages per day, or slower answers at busy times. A paid plan (subscription) is a monthly fee that raises those limits.

The short answer

Start with ChatGPT or Gemini — both have a usable free plan, both are impossible to set up wrong. If you write a lot — letters, texts, documents — add Claude. That’s it. Read on to understand why, and don’t agonize: all three are good, and switching between them takes zero effort.

Meet the big three

* There is a free plan, but the exact limits and features change often — check the official pricing page before you count on anything.

ChatGPT is the household name, and that matters: most tutorials, videos and friends’ advice are about it. It handles voice conversations, generates images, remembers things about you across sessions. If you want the safest first choice — this is it.

Claude is my personal favorite for anything involving words. In my experience it writes in a more human voice and holds a long document in view better than the other two; how much it can hold at once is a matter of the model’s context window, which differs by plan and version. If you go on to install a coding agent in Your first coding agent, you’ll meet Claude’s tools there too.

Gemini is the natural pick if you live in Google: it plugs into Gmail, Docs and Drive, and it’s excellent with very long texts. How much you get on its free plan changes often — compare the current plans on the pricing page rather than taking my word for it.

The rest of the field

• Perplexity — a search engine that answers with sources. Great for research, not a general assistant.
• Copilot (Microsoft) — built into Windows and Office. Fine if you’re already in that ecosystem.
• DeepSeek, Mistral and friends — real models, often free, but the experience is rougher and privacy policies vary. Not for day one.

You can ignore all of these for now. Two accounts, maximum.

What accounts to create

Sign up with your Google account or email — two minutes per assistant, and you can use the “Log in with Google” button if you have a Gmail address. My recommendation to start with:

1. One main assistant — ChatGPT or Gemini.
2. One alternative — so you can compare answers when something important is at stake.

That’s it. Don’t create five accounts on day one — you’ll just fragment your attention. Tool loyalty is pointless here: switch the moment another assistant serves you better.

The two-minute test drive

Don’t take my word for it — run the same question through two assistants and watch the difference. Something with real stakes, like planning a trip:

Notice the second message: the follow-up is where the magic is. This is the whole point of the previous lesson: treat the assistant as an oracle you talk to, not a vending machine you pay once.

Now the part you cannot get from a review: one prompt, three assistants, three different shapes of answer.

Press send next → on each one and read the three answers back to back: one hands you a timetable, one talks it through with you, one gives you a list and where to check it. Those are sketches of style, not a verdict — I wrote them, not the assistants, so don’t rank anyone on them. Instead, copy the prompt below and paste it into two or three real assistants yourself. The one whose answers you want to keep reading — on your own texts, your own tasks — is the one to keep.

Steal this: the comparison prompt

Paste this into two different assistants and compare the answers side by side. It doubles as a compatibility test:

I want you as my everyday assistant, so this is a test drive.

Here is my situation: [one paragraph about your life, work, and what you would like help with].

1. Ask me 3 questions that would help you help me better.
2. Then show me 3 concrete things you could do for me this week.
3. Be specific — no generic advice.

The assistant that asks better questions and gives more concrete answers — that’s your daily driver.

Make the winner yours in one message

Most assistants have a place for standing instructions: ChatGPT calls it “Custom Instructions” or memory, Claude has “Projects”, Gemini has “Saved info”. Find it in settings and paste this once. From then on you stop re-explaining yourself:

About me, so you don't have to ask every time:

- I am [who you are: job, situation, level].
- I mostly need help with: [emails, planning, learning, documents...].
- Answer in [English / Ukrainian / Russian].
- Be concrete and short. Skip the praise and the preamble.
- If my request is vague, choose one reasonable interpretation, say what you assumed, and continue.
- When you are not sure, say so instead of guessing.

What none of them give you for free

Two honest expectations to set now:

• Truth is not guaranteed. All of them can state something wrong in a calm voice. Verify facts, dates, prices and laws yourself.
• Limits are real. On a free plan you will eventually see “come back later” or get handed a smaller model at busy times. That’s not a failure — it’s the deal. Free AI tools covers what stays free and where the wall is; What AI actually costs explains what you’d be paying for.

Do this today

1. Create one account — ChatGPT or Gemini — using your Google account or email. Two minutes.
2. Paste the test-drive prompt above and answer its three questions.
3. Paste the standing instructions into settings. Then use it on one real task from today.

One assistant, one real task, tonight. The comparison can wait for tomorrow.