AI hallucination cases in Australia
May v Costaras
[2025] NSWCA 178
| Detail | What the trackers record |
|---|---|
| Court | Supreme Court of New South Wales — Court of Appeal |
| Jurisdiction | New South Wales |
| Date | 8 August 2025 |
| Who used AI | Self-represented |
| Tool named by the trackers | Not named |
| Sanction for the AI use | No professional sanction |
| Outcome | Appeal dismissed. No specific sanction for AI use, but highlighted need for judicial vigilance. |
| Citation | [2025] NSWCA 178 |
Summary from the trackers
OBITER
The self‑represented litigant’s (Respondent’s) use of generative AI in preparing oral submissions included a list of authorities, a non‑existent case, and others which, although they existed, had little to do with the legal issues in this case (see [3]–[17], [49]).
Court AI rules
Sources
- OBITER AI Hallucination Cases: Australia
- AustLII
- AI Hallucination Cases Database, Damien Charlotin (CC BY 4.0)
All AI hallucination cases in Australia · New South Wales · Court AI practice notes