MERCADO E AÇOUGUE SÃO LUCAS EIRELI v PLUXEE BENEFICIOS BRASIL S.A. (Agravo Interno nº 0000172-78.2026.8.16.0043)

Why this matter warrants attention

Fabricated: Case Law | Appellant cited judicial precedents that did not exist (jurisprudência inexistente) and were created by artificial intelligence; court treated these as invented case law and grounds for sanction. Outcome: Apelação não conhecida; multa por litigância de má-fé fixada em 5% sobre o valor atualizado da causa mantida; expedição de ofício à OAB/PR para apuração.. The court found that the appellant used artificial intelligence to produce jurisprudence with content that did not correspond to the real decisions and, in some instances, invented whole precedents. This conduct was held to violate the principle of dialecticity and to impede substantive adversarial review, amounting to litigância de má-fé. The court affirmed the monocratic decision: the appeal was not known and a 5% fine was imposed; the court also ordered referral to the bar association for investigation. The decision notes the party was given opportunity to respond and that the fabricated/misrepresented citations justified non-admission and sanction.