Apple's Siri voice assistant received a major upgrade as part of Apple Intelligence, gaining better understanding of natural language and the ability to hand off complex questions to ChatGPT. The upgraded Siri launched with iOS 18.1 in October 2024 and can now understand follow-up questions, stumbling speech, and thousands of device-specific queries it previously could not answer.

The redesigned Siri uses Apple's own large language model — a type of AI trained on large amounts of text to understand and generate human-like responses — to improve comprehension. For queries that exceed Siri's capabilities, users are offered the option to send their question to OpenAI's ChatGPT (using the GPT-4o model) without needing a ChatGPT account. Apple states that when ChatGPT is used, user IP addresses are hidden from OpenAI and requests are not stored. A further upgrade enabling Siri to understand personal context (like emails, messages, and calendar data) and take actions within apps was announced but faced delays into 2025 and 2026. In January 2026, Apple announced a partnership with Google to incorporate Gemini models into future Siri capabilities.