Apple is reportedly using a customized 1.2 trillion parameter Google model as the core for its next-generation Siri overhaul, far exceeding the scale of current mobile models. This aims to significantly boost Siri's reasoning and multimodal capabilities. A key challenge will be balancing this massive model's performance with efficient local device inference to ensure speed, privacy, and power efficiency. The move intensifies the AI competition ahead of major updates expected from Apple, OpenAI, Anthropic, and Google.