alt Hacker NewsModels absolutely do reproduce books.
> With a simple two-phase procedure, we show that it is possible to extract large amounts of in-copyright text from four production LLMs. While we needed to jailbreak Claude 3.7 Sonnet and GPT-4.1 to facilitate extraction, Gemini 2.5 Pro and Grok 3 directly complied with text continuation requests. For Claude 3.7 Sonnet, we were able to extract four whole books near-verbatim, including two books under copyright in the U.S.: Harry Potter and the Sorcerer’s Stone and 1984.
The supplementary files in that paper—verbatim reproductions of the full texts of Frankenstein and The Great Gatsby—are pretty instructive. The research group highlighted all additions and omissions, but on most pages the differences are difficult to spot because they are only missing spaces, extra hyphens, and other typographical minutiae.