ChatGPT, Claude and Gemini answers side by side

Ask ChatGPT, Claude and Gemini the same question and you will often get three different answers. That is not a bug to hide; it is the most useful signal you have. Where they agree, you can move on. Where they disagree, you know exactly where to look.

Why a second answer is worth it

Every model makes mistakes with the same calm confidence it uses when it is right. One answer gives you no way to tell the difference. A second model, asked independently, fails in different places. Comparing the two turns "is this right?" into a much smaller question: "which of these two points is right?"

This matters most for work that has consequences: a contract, a price, code that will run, a fact you will repeat.

How to compare answers fairly

• Ask the same question, word for word. Different wording gets different answers, and then you are comparing prompts.
• Give both the same material. If one sees the document and the other does not, the comparison means nothing.
• Look at the disagreements first. Read the points where the answers differ before reading anything they share.
• Ask each to check the other. Show model B the answer of model A and ask what is wrong with it.
• Keep the cost in view. Two strong models cost twice. For simple questions, one lighter model is often enough; the model picker shows which.

Doing it in one chat

Copying a question between three browser tabs works, but it is slow and the answers drift apart. In Cortex66 you ask once in one chat, and the AIs you use (your own keys, or the Claude and ChatGPT you connect) answer in that same chat. Before anything runs, a receipt shows which models will answer, who checks the result, and the most it can cost.

If you want to see how Cortex66 compares to other multi-model tools, including where they are the better choice, read the honest comparison.

Read more

• Which AI model for which task
• ChatGPT Plus or an API key: which costs you less?
• Your AIs working together in one chat

FAQ

Which is better, ChatGPT, Claude or Gemini?

It depends on the task, and it changes as models are updated. Comparing answers on your own work is the most reliable test.

Is it worth paying for more than one AI?

For important answers, a second opinion catches mistakes one model misses. For everyday questions, one model is usually enough.

Can I ask several AIs the same question at once?

Yes. In Cortex66 you ask once, and the AIs you connected answer in the same chat, with the cost capped before anything runs.

How do I know which answer is right?

Start with the points where the answers disagree, ask each model to check the other, and verify those points yourself.