Encyclopedia Britannica and its subsidiary Merriam-Webster sued OpenAI in Manhattan federal court, alleging the company used nearly 100,000 Britannica articles and other copyrighted reference content without authorization to train its large language models. The complaint says ChatGPT can reproduce or closely paraphrase Britannica encyclopedia and dictionary material, and further alleges OpenAI uses retrieval-augmented generation to pull from Britannica content in real time. The publishers argue that these outputs substitute for visits to their own sites, reducing subscription and advertising revenue that supports their editorial operations.
The lawsuit also includes trademark-related claims, alleging ChatGPT has presented fabricated material under Britannica's name and displayed incomplete reproductions in ways that could imply endorsement. OpenAI disputed the allegations, saying its models are trained on publicly available data and are grounded in fair use. The case adds to a broader wave of litigation by publishers and other rights holders against AI companies over model training and output practices, and follows Britannica's separate pending lawsuit against Perplexity AI.

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OpenAI responded to the lawsuit by denying the allegations and stating that its models are trained on publicly available data under fair use. The company framed the case as part of the broader legal dispute over whether AI training on public content is lawful.
Encyclopedia Britannica and its subsidiary Merriam-Webster filed a lawsuit against OpenAI in Manhattan federal court, alleging OpenAI copied their copyrighted encyclopedia and dictionary content without authorization to train its AI models. The complaint also alleges ChatGPT reproduces or closely paraphrases their material, uses Britannica content in real time via retrieval-augmented generation, and harms traffic and revenue while creating misleading trademark-related attributions.
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