AI-Generated Defamation: When Artificial Intelligence Writes Lies About You

Artificial intelligence is generating a new category of reputational crisis. Chatbots hallucinate facts, image generators fabricate scenes, and AI-powered search summaries confidently state falsehoods about real people. When an AI system produces false, damaging content about you or your business, the question is: who is legally responsible — and what can you do about it?

What Is AI-Generated Defamation?

AI-generated defamation occurs when an automated system — a large language model (LLM), image generator, or AI search feature — produces false statements of fact that damage a real person's reputation. Examples include:

• A chatbot incorrectly attributing criminal conduct, fraud, or professional misconduct to a named individual
• An AI search summary (such as Google AI Overviews) presenting false biographical claims in response to a name query
• AI-generated images falsely depicting a person in a harmful or degrading scenario
• AI-written articles, social media posts, or reviews that fabricate events involving identifiable individuals
• Deepfake videos placing real people in fabricated situations, covered by both defamation law and the Online Safety Act 2023

For more on deepfake content specifically, see our guide to deepfake defamation under UK law.

Does UK Defamation Law Apply to AI-Generated Content?

UK defamation law does not require a human author. Under the Defamation Act 2013, what matters is whether a false statement of fact has been published to a third party and has caused or is likely to cause serious harm to the claimant's reputation. AI-generated content served to users through a product or platform constitutes publication. The companies that develop and deploy AI tools are the publishers for legal purposes.

Who Is Liable for AI-Generated Defamation?

The AI Developer

The company that builds and trains the underlying model — OpenAI, Google, Microsoft, Meta, or others — controls the system's outputs. Where the system produces defamatory content as a foreseeable consequence of its design or training data, the developer may face liability as the primary publisher.

The Platform or Deployer

Many AI tools are deployed by third parties using LLM APIs. In that case, both the underlying model developer and the deploying business may face liability as joint publishers.

Intermediary Protections

Platforms may seek to rely on intermediary defences, but AI systems that actively generate content are unlikely to qualify as passive hosts. The Online Safety Act 2023 imposes new duties on regulated platforms to address illegal content — including AI-generated defamation.

The Hallucination Problem

LLMs "hallucinate" — generating plausible-sounding but entirely fabricated information. For individuals and businesses, this is particularly acute because:

• False content is presented with apparent authority and without caveats
• Users may trust AI outputs more readily than anonymous web content
• Content may be generated freshly for each user, making monitoring difficult
• Traditional content removal mechanisms are not designed for dynamically generated content

Practical Steps If AI Has Defamed You

1. Document the output: Screenshot or record the AI-generated content, including the query that produced it and the date.
2. Report through the platform's mechanisms: Submit a formal report citing the false content and the harm it causes.
3. Send a legal letter: A solicitor's letter identifying the defamatory output and demanding corrective action creates a formal record and triggers the platform's notice-and-takedown obligations.
4. Consider injunctive relief: Where harm is ongoing and serious, an interim injunction preventing the content from being generated or served may be appropriate.
5. Pursue a damages claim: If the defamatory content has caused quantifiable harm — lost business, damaged professional relationships, emotional distress — a damages claim against the developer or deployer is viable.

Prevention and Monitoring

• Regularly query major AI systems with your name or business name to check for inaccurate outputs
• Set up Google Alerts and social listening tools to detect republication of AI-generated falsehoods
• Ensure your online presence provides AI systems with accurate, authoritative information to counteract hallucinations
• Act promptly — the limitation period runs from when the content was first served to a third party

Conclusion

AI-generated defamation is a rapidly evolving area where established legal principles meet novel technology. If an AI system has published false, damaging content about you, contact our team for a confidential assessment of your options.

Related reading: Deepfake defamation under UK law | ChatGPT and AI defamation | Online Safety Act and defamation | Unmasking anonymous defamers