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Hidden LLM Inside macOS 27 Terminal

This article shows how macOS 27 includes a built-in LLM accessible via /usr/bin/fm that runs entirely offline and needs no account. The author tests it on an M1 MacBook Air, noting its limited memory, occasional inaccuracies, and a range of Terminal-based tricks.
  • macOS 27 includes an offline, account-free LLM ("Apple Foundation Models") accessible via /usr/bin/fm in Terminal
  • Runs smoothly on a base M1 MacBook Air with 8GB RAM, though it has limited memory and no awareness of current dates
  • Useful for practical tasks like drafting emails, translation, summarizing Markdown, generating regex/SQL, and shell scripting help
  • Prone to hallucinating dates or inventing functions when pushed beyond simple tasks
Last saved Jul 24, 2026 · 1 min read
macos terminal llm command-line local-ai