Your Mac might already have a free AI chatbot built right into it, and you probably had no idea it was there. No ChatGPT subscription, no downloading a separate AI app and no internet connection required once the model is ready to go. Just local AI when you need it.
That's what X user Alex Choi discovered this week when he posted about finding a local large language model (LLM) hiding inside his MacBook's Terminal app.
"wtf i just discovered that a macbook comes with a free local LLM in your terminal," he wrote in a post on October 21 that attracted more than 1 million views in the accompanying screenshot.
The discovery caught people's attention for a good reason. We're used to opening ChatGPT, Claude or Gemini in a browser whenever we need AI assistance. But if you're running macOS 27 on a compatible Mac, Apple has already given you another option. And accessing it is surprisingly easy.
wtf i just discovered that a macbook comes with a free local LLM in your terminal https://t.co/Kegrr2aYUsOctober 21, 2026
The feature is called Apple Foundation Models CLI, or fm for short. Apple introduced it with macOS 27 Golden Gate, which arrived in September.
Unlike ChatGPT or Claude, which typically send requests to cloud servers, Apple's built-in tool can run an AI model directly on your Mac. This means a you can ask questions, brainstorm ideas, rewrite text and get help with everyday tasks without sending your prompts to an external AI service.
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