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How To Write With An LLM

AnnouncementProductSep 17, 2026

Thomas Ptacek argues that LLMs work best as copyeditors rather than writing assistants, recommending a strict rule against using any phrase an LLM suggests. He uses LLMs for fact-checking, spelling, grammar, and thesaurus purposes, but never for drafting content. He also shares a screenshot of his personal LLM copyediting tool and a prompt to help readers build their own.

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OpenAICompanyChatGPT WorkModelGPT-6 AstraModelThomas PtacekPerson
Canonical: https://simonwillison.net/2026/Sep/17/how-to-write-with-an-llm/