Can ChatGPT do a prior art search?

ChatGPT can help you plan a prior art search, but it is not a patent database and its output is not a search. A language model has no reliable, current index of patent literature, so it fills gaps with plausible-looking patent numbers, titles and applicants that do not exist, and it cannot tell you what it missed. With web browsing switched on it can retrieve real documents, but every reference still has to be checked at the source before you rely on it. The USPTO's 2024 guidance on AI tools makes that verification the practitioner's responsibility, not the tool's.

Used well, ChatGPT or Claude is a search assistant: it can generate synonyms and alternative terms for your invention, suggest CPC and IPC classification codes to browse, draft Boolean search strings, and summarise documents you paste in. Run the actual search in Google Patents, USPTO Patent Public Search, Espacenet or WIPO PATENTSCOPE, all free. Keep the confidentiality point in mind: describing your invention in enough detail to search for it is describing your invention, so use an assistant that does not train on your prompts. Lightbringer runs prior art searching inside the platform as part of the disclosure review, before an attorney sees the case. See also What is prior art search?