OpenAI says its partnership with Apple to integrate ChatGPT into Siri “persistently underperformed,” according to court documents filed in OpenAI’s ongoing legal dispute involving Elon Musk’s companies. The filing characterizes the Siri integration as “dramatically underperforming” by the time Musk’s group filed an antitrust lawsuit against Apple and OpenAI, with later statements describing the performance as persistently weak.

Apple added ChatGPT to Siri in December 2024, but the feature required a multistep opt-in process, which OpenAI said added friction. OpenAI states that by January 2025 it reduced expectations for incremental logged-in weekly active users from the partnership, describing the rollout as “off to a slow start.” Some portions of the documents are redacted, including a March 2026 conversation between Apple and OpenAI.

The outlets describe the same dispute as part of a broader antitrust challenge. OpenAI disputes claims in the lawsuit brought by Musk’s companies, including any suggestion of an exclusive arrangement or customer harm, and argues that any foreclosure effects would be de minimis. Musk’s companies reportedly dropped their claims against Apple earlier this month, leaving OpenAI as the sole defendant, while OpenAI seeks dismissal of claims ahead of a planned January 2027 trial.