Siri AI, as Apple calls it, is more than just a basic phone voice assistant. To be clear, the new Siri AI is a massive improvement over old Siri in just about every way. Claude Opus 4.1, Opus 4.6, Opus 4.7, Opus 4.8, and Opus 5 along with other variants like Mythos, Fable, and Sonnet. OpenAI — ChatGPT 5, GPT 5.1, GPT 5.2, GPT 5.3, GPT 5.4, GPT 5.5, and GPT 5.6. ChatGPT 5, GPT 5.1, GPT 5.2, GPT 5.3, GPT 5.4, GPT 5.5, and GPT 5.6.