"This landmark settlement far surpasses any other known copyright recovery," said plaintiffs' attorney Justin Nelson. "It is the first of its kind in the AI era."

The settlement stems from a class-action lawsuit filed by authors Andrea Bartz, Charles Graeber, and Kirk Wallace Johnson, who accused Anthropic of illegally copying their books to train Claude, the company's AI chatbot that rivals ChatGPT.

In a partial victory for Anthropic, US District Court Judge William Alsup ruled in June that the company's training of its Claude AI models with books -- whether bought or pirated -- so transformed the works that it constituted "fair use" under the law.

"The technology at issue was among the most transformative many of us will see in our lifetimes," Alsup wrote in his decision, comparing AI training to how humans learn by reading books.

However, Alsup rejected Anthropic's bid for blanket protection, ruling that the company's practice of downloading millions of pirated books to build a permanent digital library was not justified by fair use protections.

"We remain committed to developing safe AI systems that help people and organizations extend their capabilities, advance scientific discovery, and solve complex problems," Anthropic deputy general counsel Aparna Sridhar said in response to an AFP inquiry.

San Francisco-based Anthropic announced this week that it raised $13 billion in a funding round valuing the AI startup at $183 billion.

Anthropic competes with generative artificial intelligence offerings from Google, OpenAI, Meta, and Microsoft in a race that is expected to attract hundreds of billions of dollars in investment over the next few years.

- Thousands of books -

According to the legal filing, the settlement covers approximately 500,000 books, translating to roughly $3,000 per work -- four times the minimum statutory damages under US copyright law.

Under the agreement, Anthropic will destroy the original pirated files and any copies made, though the company retains rights to books it legally purchased and scanned.

"This settlement sends a strong message to the AI industry that there are serious consequences when they pirate authors' works to train their AI, robbing those least able to afford it," said Mary Rasenberger, CEO of the Authors Guild, in a statement supporting the deal.

The settlement, which requires judicial approval, comes as AI companies face growing legal pressure over their training practices.

A US judge in June handed Meta a victory over authors who accused the tech giant of violating copyright law by training Llama AI on their creations without permission.

District Court Judge Vince Chhabria in San Francisco ruled that Meta's use of the works to train its AI model was "transformative" enough to constitute "fair use" under copyright law.

- Apple Intelligence -

Meanwhile, Apple on Friday was targeted with a lawsuit by a pair of US authors accusing the iPhone maker of using pirated books to train generative AI built into its line-up of devices.

The tech titan's suite of capabilities called "Apple Intelligence" is part of a move to show it is not being left behind in the AI race.

"To train the generative-AI models that are part of Apple Intelligence, Apple first amassed an enormous library of data," read the suit.

"Part of Apple's data library includes copyrighted works -- including books created by plaintiffs -- that were copied without author consent, credit, or compensation."

Apple "scraped" works from sources including "shadow libraries" stocked with pirated books, the suit contends.

Apple did not immediately reply to a request for comment.

The suit filed against Apple by Grady Hendrix, author of "My Best Friend's Exorcism," and Jennifer Roberson of Arizon, whose books include "Sword-Bound," seeks class action status.