Who's Behind Your AI?
The app is the car. The model is the engine. When you talk to an AI, the name on the screen is the car — but a company you may never have heard of built the engine that actually answers you. Same as cars: different brands can share one engine, and one brand can swap engines without telling you much about it.
The map — who answers when you type
| The app (the car) | The engine, and who builds it |
|---|---|
| ChatGPT | OpenAI's GPT engines — currently the GPT-5 series. OpenAI builds both the car and the engine. |
| Claude | Anthropic's Claude engines (Sonnet and Opus series). Anthropic builds both. |
| Gemini | Google's Gemini engines (currently the Gemini 3 series). Google builds both. |
| Microsoft Copilot | Here's the one that surprises people: Microsoft's car runs other companies' engines — OpenAI's GPT-5 series by default, with Anthropic's Claude available in parts of it. Microsoft builds the car, not the main engines. |
| Meta AI (Facebook, Instagram, WhatsApp) | Meta's own Llama-family engines, built by Meta. |
| Grok (on X/Twitter) | xAI's Grok engines, built by xAI. |
✓ Checked against current sources: July 2026. Engines change often — the app keeps its name while the engine underneath gets swapped. That's part of the point.
Why should you care?
Because what you type goes to whoever runs the engine — under their rules, on their computers, in their country. When you tell "Copilot" something, you're often telling OpenAI. The name on the car doesn't tell you where your words end up.
And because engines get swapped. The helpful assistant you trusted last month may be a different engine this month, with different behavior and a different company behind it. Your habits stay; the listener changes.
Three habits that protect you with any engine
1. Assume the engine reads everything you type. Names, numbers, addresses — if you wouldn't put it on a postcard, don't put it in a prompt.
2. Keep your own copy. Your conversations live in their account, not yours — and some paid plans won't even let you export them. Our free Chat Keeper puts your copy in your hands.
3. Ask the car dealer what engine is in it. It's a fair question for a car, and it's a fair question for an AI. If the answer is hard to find, that tells you something too.