Authors asked a judge to rule OpenAI's training unlawful

The writer's problem

Three years after filing suit, the Authors Guild and its co-plaintiffs faced a procedural choice rather than a factual one: ask the court to decide the case outright, or let it go to trial. On 4 September 2026 the plaintiffs filed a motion for summary judgment against OpenAI and Microsoft, as the guild's own case update describes, in the consolidated proceeding In re OpenAI, Inc., Copyright Infringement Litigation before Judge Sidney Stein in the Southern District of New York.

What the documents show

A summary-judgment motion, the guild's update explains, asks a court to rule as a matter of law even when the facts are taken as the other side presents them; if the court instead finds a disputed material fact, the case proceeds to trial. The plaintiffs' brief, as quoted in the update, argues that OpenAI's models pose a threat to authors because the company built training sets partly from pirated copies and that the resulting models can generate derivative text on request. OpenAI and Microsoft filed their own cross-motions the same week, meaning both sides are asking the court to decide the fair-use question without a trial, from opposite conclusions. The guild's account also traces the case's path: the original 2023 filing was consolidated with other class and news-publisher suits, including the New York Times' case, into one multidistrict proceeding on 3 April 2025. None of this is a ruling; it is a description of competing motions still awaiting decision, with opposition briefs due in October 2026 and replies in November.

The editorial choice

For a publisher weighing contract language on AI-training rights while this motion is pending, treating the outcome as settled in either direction would be premature. The editorial position taken here is to describe the brief's arguments as arguments, attributed to the plaintiffs, rather than as established fact about what any model's training data contains or what harm has occurred.

What stays with the author

The named authors remain the credited writers of their own novels no matter how the motion is resolved, and the guild's own income-survey citations elsewhere in its advocacy are separate from what this brief itself proves. What the sources do not resolve is whether the court will find a triable dispute of fact or decide the fair-use question outright; that remains for Judge Stein.

• Is a given account of this case describing an argument in a brief or a judge's ruling?
• Which specific claims does the cross-motion make, and do they mirror or oppose the plaintiffs' theory?
• How does this motion's procedural posture compare with the fair-use rulings already issued in the Anthropic and Meta cases?

A summary-judgment filing narrows a lawsuit's questions for a judge; it does not itself answer them, and coverage that treats a motion as a verdict is describing something the document does not yet say.