Bourse de l'Immobilier Multilogements inc. c. Lanthier
CS Québec · Oct 29, 2025
What happened in this matter?
The Quebec Superior Court sanctioned a self-represented litigant for filing a document containing AI-generated fictitious case law. The court ordered the party to pay 750 CAD in compensation to the plaintiffs for the time spent verifying the false citations, citing the party's failure to validate the accuracy of the AI-generated content.
- Why the court cared
- Fabricated: Case Law | Document généré par ChatGPT citant une décision inexistante au paragraphe 4.3; la Cour constate la fiction de la référence. || Fabricated: Case Law | Document généré par ChatGPT citant une décision inexistante ou incorrecte; la Cour constate la fiction de la référence. || Fabricated: Case Law | Document généré par ChatGPT citant une décision avec référence incomplète/incorrecte; la Cour conclut qu'il s'agit d'une citation fictive.
- Why it matters now
- Quebec courts will impose costs for ChatGPT-generated fictitious citations even against self-represented parties.
Why this matter is tracked
In a Quebec Superior Court proceeding, a self-represented third party, Christian Bordeleau, filed a document generated by ChatGPT containing three fictitious jurisprudential citations. The court determined that the inclusion of these fabricated references constituted a significant breach of the orderly conduct of the proceedings under Article 342 of the Code of Civil Procedure. Although the court accepted the party's good faith and lack of intent to deceive, it emphasized that self-represented litigants bear personal responsibility for the accuracy of all documents filed. Consequently, the court ordered the party to pay a monetary compensation of 750 CAD to the plaintiffs to cover the costs of verifying the fictitious citations.
Quebec courts will impose costs for ChatGPT-generated fictitious citations even against self-represented parties.
Record details
What the record establishes about AI use
The party admitted to using ChatGPT.
Judgment on a management notice regarding the production of undertakings and the use of AI-generated fictitious citations.
Correction behavior is not separately verified in the current record.
Tracked discrepancy record
3 citation, quotation, or authority issues are recorded in the source dataset.
- Fabricated: Case Law | Document généré par ChatGPT citant une décision inexistante au paragraphe 4.3; la Cour constate la fiction de la référence.
- Fabricated: Case Law | Document généré par ChatGPT citant une décision inexistante ou incorrecte; la Cour constate la fiction de la référence.
- Fabricated: Case Law | Document généré par ChatGPT citant une décision avec référence incomplète/incorrecte; la Cour conclut qu'il s'agit d'une citation fictive.
Questions this record answers
- What happened in Bourse de l'Immobilier Multilogements inc. c. Lanthier?
- The Quebec Superior Court sanctioned a self-represented litigant for filing a document containing AI-generated fictitious case law. The court ordered the party to pay 750 CAD in compensation to the plaintiffs for the time spent verifying the false citations, citing the party's failure to validate the accuracy of the AI-generated content.
- Why does Bourse de l'Immobilier Multilogements inc. c. Lanthier matter for legal AI risk?
- Quebec courts will impose costs for ChatGPT-generated fictitious citations even against self-represented parties.
- What does the public record establish about Bourse de l'Immobilier Multilogements inc. c. Lanthier?
- Retained unchanged after audit: the existing summary is source-specific, non-placeholder, and supported by the recorded source link. Read the underlying source before relying on it for legal advice or a filing.
- Which source supports this Bourse de l'Immobilier Multilogements inc. c. Lanthier summary?
- The recorded source is Damien Charlotin case archive. It is classified as publisher document archive; review the linked material and subsequent docket history before relying on this summary.
Related matters
Related by court, jurisdiction, tool, or classified failure pattern. Similarity does not imply the same facts or outcome.