Can ChatGPT write a patent application?

ChatGPT can produce text that looks like a patent application, but not one you should file. A general-purpose model does not search the prior art, cannot judge how broad a claim can be before an examiner rejects it, and will invent plausible-looking citations and references. It also has no view of what your competitors have filed, which is what decides whether a claim is worth anything commercially. The typical output is either claims so broad they fail novelty or so narrow they are easy to design around.

The rules reflect this. The USPTO's April 2024 guidance allows AI-assisted drafting but holds the person who signs the filing responsible for verifying every statement in it, and says that relying on an AI tool's output does not count as a reasonable inquiry. Under the USPTO's revised inventorship guidance of November 2025, AI is a tool, not an inventor: a natural person must have conceived what is claimed. Where ChatGPT and Claude are useful is the step before drafting, turning a design document or a conversation into a structured invention disclosure that states the problem, the solution, the alternatives and why it differs from what exists. That is the input a patent attorney needs. Lightbringer uses AI for exactly this, and for first drafts, with a registered patent attorney reviewing and signing every application before it is filed.