28 Authors Sue Anthropic Over Claude Training Data in Post-Bartz Class Action

A New Class Action Lands on Anthropic's Doorstep

Just months after Anthropic settled the high-profile Bartz v. Anthropic authors' suit, a fresh group of 28 writers and book packagers has filed a new copyright class action against the AI company in the U.S. District Court for the Northern District of California. The complaint, captioned Cruz v. Anthropic PBC (Case No. 3:26-cv-04482), was filed on May 13, 2026 and alleges that Anthropic's "exploitation of Plaintiffs' copyrighted works to build its 'Claude' family of large language models" infringes their rights on a massive scale.

The case has been assigned to U.S. Magistrate Judge Susan van Keulen, with consent or declination to magistrate jurisdiction due by May 28. The plaintiffs are represented by Elizabeth Rogers Brannen of Stris & Maher LLP, the same firm that has been increasingly active in author-led generative AI litigation.

For an industry that hoped the Bartz settlement might cool the temperature on Anthropic's training data exposure, the new filing is a clear signal that authors are not backing off.

Who Is Suing

The lead plaintiff is novelist Angie Cruz, but the named plaintiff list reads like a cross section of contemporary American letters and trade publishing. Among the 28 plaintiffs:

• Dave Eggers, the bestselling novelist, McSweeney's founder, and a longtime advocate for author rights
• Vendela Vida, novelist and co-founder of The Believer
• Jaquira Diaz, memoirist and 2026 Whiting Award recipient
• Carolina De Robertis, novelist and translator
• Aya de Leon, author of the Justice Hustlers series
• Matt Birkbeck, the investigative journalist and true-crime author
• Marla Heller, dietitian and author of The DASH Diet franchise
• Lynn Sonberg and Lynn Sonberg Book Associates, a long-running book packager
• Academic and nonfiction authors including Walter Gmelch, John Ferejohn, Sinan Ciddi, and Nicole Gonzalez Van Cleve
• Genre authors Dennis Carstens and Daniel James
• Photographer Sean Arbabi and music producer Martin Atkins, among others

The mix matters. The plaintiff group spans literary fiction, narrative nonfiction, academic writing, self-help, true crime, and book-packaging entities that own copyrights to large catalogs they license to publishers. That breadth gives the case a wider evidentiary surface than a more narrowly defined author class.

What the Complaint Alleges

According to the docket entry on CourtListener, the 30-page complaint targets Anthropic's training of its Claude family of large language models. It frames Anthropic's conduct as commercial exploitation of copyrighted books rather than transformative research, and it focuses squarely on the data used to build Claude rather than on Claude's outputs.

While the full pleading details are still being parsed, the structural choice to bring a single 28-plaintiff complaint, accompanied by an Exhibit A presumably listing copyrighted works at issue, mirrors the approach trial lawyers have used to keep individual standing rock solid in earlier AI training cases. By naming each author and identifying their works on the front end, plaintiffs aim to insulate the case from the standing and registration challenges that have tripped up some earlier generative AI lawsuits.

A separate AO-121 form, the standard "Report on the filing or determination of an action regarding Copyrights," was also filed with the complaint and is being mailed to the U.S. Copyright Office.

Why This Filing Matters

Three things make Cruz v. Anthropic worth watching.

1. It comes after Bartz, not before it. The earlier Bartz v. Anthropic litigation produced a settlement that, while confidential in many of its operative terms, did not extinguish copyright owners' broader claims against Anthropic. The Cruz plaintiffs are not part of the Bartz class and are pursuing their own theory of liability. That undercuts any narrative that Anthropic has "resolved" its book-training exposure.

2. The named plaintiffs include heavy hitters. Dave Eggers in particular brings a public profile that goes well beyond the typical AI training class action. He has spoken and written publicly about the relationship between independent publishing and tech platforms for two decades, and his presence as a named plaintiff increases the chance that the case will draw amicus interest from publishing trade groups and authors' organizations.

3. The forum is the same as Bartz. Filing in the Northern District of California means the new case will be measured against rulings that judges in that district have already issued in Bartz, Kadrey v. Meta, and the still-developing Concord v. Anthropic music publishers' case. Anthropic cannot easily argue that the new plaintiffs are venue-shopping, and several of the procedural questions about discovery scope, training-data identification, and class definition have already been litigated nearby.

The Broader Landscape

The Anthropic filing comes in the same week as a wave of new AI copyright complaints in other districts. On May 11 and 12, plaintiffs led by journalist Robin Amer and others filed a coordinated set of voice-cloning suits in the Northern District of Illinois against Amazon (1:26-cv-05497), NVIDIA (1:26-cv-05478), Eleven Labs (1:26-cv-05437), and Alphabet (1:26-cv-05436), alleging that commercial AI voice models were built using the voices of real people without consent. A separate suit, Poseidon Wave Media LLC v. Suno, Inc. (1:26-cv-03921), was filed in the Southern District of New York on May 12 over alleged copyright infringement by the AI music generator.

Taken together, the filings show plaintiffs methodically extending the AI training liability theory across modalities, from books to voice to music, and refusing to wait for the slowest-moving cases to set the entire framework.

What to Watch Next

Key procedural milestones in Cruz v. Anthropic:

• May 28, 2026 — deadline for the parties to consent to or decline magistrate jurisdiction. If consent is declined, the case will be reassigned to an Article III district judge.
• Service window — Anthropic is expected to be served in the coming weeks, after which it will have 21 days to respond.
• Likely first motion — based on Anthropic's playbook in Bartz, expect a motion to dismiss or to compel arbitration to test the plaintiffs' standing, registration, and willfulness allegations.

For rights holders watching the AI copyright space, Cruz v. Anthropic is the clearest sign yet that the post-Bartz environment is not a settlement-driven peace. It is the next round.

This article reflects publicly available docket information as of the filing date and is not legal advice. Anthropic has not yet filed a response to the complaint. Court documents are available on PACER and CourtListener.