The differences between the main AIs

All these tools work through text and seem to do the same thing. But in 2026 each one has a strength. Knowing the difference keeps you from thinking AI is weak when, in fact, you just picked the wrong one for the task.

ChatGPT (OpenAI)

The most used in the world and the most versatile. Good at almost everything: writing, researching, creating images, reading files, organizing. It is the best entry point and the right choice when you do not know which to use. It has a free version.

Claude (Anthropic)

The best for long text and documents. It reads contracts, PDFs and long reports, summarizes and points out things to watch for with clarity. It is also one of the leaders in programming. If your problem is reading and understanding a big document, this is the one. It has a free version.

Gemini (Google)

Integrated with Gmail, Docs and Drive. If your company lives in Google, it works inside your tools. It has the most generous free version and handles huge documents. Good value for the money.

Copilot (Microsoft)

Made for those who live in Word, Excel, Outlook and Teams. It helps inside those programs. If your operation runs on Microsoft 365, it is the most integrated.

Grok (xAI)

Its strength is real-time information, because it is connected to X (Twitter). Good for following news and the market live. It is weaker at code and, on controversial topics, it can lean toward the opinion of whoever created it.

Which one the contractor should choose

You do not need to subscribe to all five. Start with one, learn to talk to it, and then try another. The way you ask (the prompt) is almost the same in all of them, so what you learn in one serves for the rest.