The Bartz v. Anthropic lawsuit is the first major AI training data copyright case to result in a billion-dollar settlement. Here's the full story — the allegations, the litigation, the key twists, and what comes next.
The Alleged Infringement
On or around August 10, 2022, Anthropic allegedly downloaded massive pirated book datasets known as LibGen (Library Genesis) and PiLiMi. LibGen is one of the internet's largest shadow libraries, hosting millions of copyrighted books without authorization from their publishers or authors. PiLiMi is a similar dataset.
Anthropic allegedly used these datasets — containing approximately 400,000 copyrighted books — as training data for Claude, its AI assistant. The company did not license these works or compensate the copyright holders.
Authors and rights-holders filed suit in the Northern District of California, alleging massive copyright infringement.
The Case Under Judge Alsup
The case was initially assigned to Judge William Alsup, a federal district judge known for his technical sophistication (he famously learned to code to better understand the Oracle v. Google copyright litigation) and tough questioning of both sides.
During hearings, Judge Alsup expressed skepticism about the size of the proposed attorney fee request. In a December 23, 2025 memo, he sharply criticized several "interloper" law firms that sought to claim fees from the class fund — firms that had not done significant work on the case but sought a share of the award. He characterized their efforts as inappropriate attempts to raid the settlement fund at authors' expense.
The Judge Change
In December 2025, Judge Alsup took inactive status. The case was reassigned to Judge Araceli Martinez-Olguin, a newer appointee to the Northern District.
The judge change has practical significance. Judge Alsup's reputation for skepticism and control over fee requests had set a certain tone. While Judge Martinez-Olguin has continued in his footsteps by slashing the fee request (see below), attorneys and litigants had to recalibrate to a new judicial temperament as the case heads toward final approval.
The Settlement Terms
The parties agreed to a $1.5 billion settlement. Key terms:
- Total fund: $1.5 billion
- Eligible works: ~490,000 books on the Anthropic Works List
- Claimant requirement: Copyright holders who filed claims by March 30, 2026
- Distribution method: Pro rata based on number of qualifying works per claimant
- Attorney fees (revised): $187.5 million (12.5% of the fund), down from the original $375 million (25%) request
The Attorney Fee Cut — Big News for Authors
On March 23, 2026, Judge Martinez-Olguin issued an order cutting the plaintiff attorneys' fee request in half. The lawyers had sought $375 million (25% of the fund). The judge awarded $187.5 million (12.5%).
This is significant for claimants. The cut means approximately $187.5 million more flows to authors than was originally budgeted. For individual claimants, this translates to higher per-work payouts than initial estimates suggested.
The Opt-Outs
Not everyone took the settlement lying down. Notable journalist John Carreyrou — author of Bad Blood — opted out of the settlement, along with several other authors.
Their argument: the class action resolves copyright claims "for pennies on the dollar" against not just Anthropic but also Google, OpenAI, Meta, xAI, and Perplexity. By settling with Anthropic alone, they argued, class members are releasing too broad a set of claims against a wider universe of AI defendants.
The opt-out group plans separate litigation against the AI industry broadly. Whether their bet pays off depends on the outcome of those cases — and the timeline could be years away.
The Claims Filing Reality
As of October 31, 2025, only approximately 58,788 works had claims filed — roughly 12% of the ~490,000 eligible works on the Anthropic Works List.
This is striking. It means the vast majority of eligible authors either don't know about the settlement, missed the deadline, or chose not to participate. For those who did file, this low claim rate potentially means higher per-work payouts — though the final number won't be known until after the claims review is complete.
What Happens at the April 22 Hearing
April 22, 2026 is the final approval hearing date. Judge Martinez-Olguin will determine whether to grant final approval to the settlement.
At the hearing, she will consider:
- Objections filed by class members
- The fairness, reasonableness, and adequacy of the settlement
- Whether the fee award (already reduced to $187.5M) is appropriate
- Whether class notice was adequate
Given that preliminary approval was already granted and the case has advanced this far, final approval is widely expected — though not guaranteed. Appeals following final approval could delay distributions further.
The Payment Schedule
Assuming final approval on April 22, 2026:
For authors waiting on payment, this timeline means real money is still a year or more away. That's one reason many are choosing to sell their claims now rather than wait.
What It Means for You
If you have a valid claim in the Bartz v. Anthropic settlement:
- You are entitled to a share of roughly $1.3 billion after fees
- Per-work amounts are estimated at $1,500–$5,600, but could be higher given the low claim rate
- Distributions are not expected until late 2026 at the earliest
- You can sell your claim now for an immediate cash offer
Check your works and get an offer →
TrainedOnYou is an independent litigation finance company not affiliated with Anthropic PBC or the settlement administrator. This article is for informational purposes only.