> The ChatGPT integration, powered by GPT‑4o, will come to iOS, iPadOS, and macOS later this year. Users can access it for free without creating an account, and ChatGPT subscribers can connect their accounts and access paid features right from these experiences.
What I could find is that iPhone users get it for free regardless:
https://openai.com/index/openai-and-apple-announce-partnersh...
> The ChatGPT integration, powered by GPT‑4o, will come to iOS, iPadOS, and macOS later this year. Users can access it for free without creating an account, and ChatGPT subscribers can connect their accounts and access paid features right from these experiences.