AI 不该只替你干活，该补你的脑子
十年里我们衡量 AI 的标准是「它自己能干多少」，这篇把尺子掉了个头：问「它能让一个具体的人变多聪明」。作者给这类系统起名「认知共生体」——不是等你开口的助手，而是长期贴身、实时、私密、低摩擦、还会主动的那种：通过外部设备感知你所感知的，把你的上下文记好几年，建模你此刻的处境和你的心思，在你需要的那一刻插进你的思考，顺手替你办掉日常事，并且随着你变、它也跟着学你。他们把这个范式的核心概念定为「认知差」:你能带进一个处境的能力，和你工作记忆里真正装得下的那部分，中间那道缺口。设计空间被画成一个共生循环——感知、留存、理解、共处、代你行动、与你同想、一起成长，外面套着个人运行时和信任两层壳。它也诚实地点了代价：当共生体改变了你在别人面前能做到的事，新风险就来了，从考试里的隐形助攻，到人人都被迫装一个的压力，作者把治理直接算进范式里。它不是你明天能用上的东西，但它换掉了「AI 要多强」这个问法。
📄 原文摘要(英文)
For a decade, progress in artificial intelligence has been measured by how much a machine can do on its own. Large foundation models now write code and run multistep tasks, and personal agents act on a person's behalf. Yet people still forget what they once knew, miss what they are not looking at, fail to find the right words, and face hard choices without the benefit of their own history, because the machine that could help stands outside the situation. As AI moves into the physical world, attention has settled on one kind of intelligent individual, the embodied robot; we argue that the era of Physical AI holds a second kind of equal importance, the person augmented by AI. Alongside artificial general intelligence, which asks how intelligent a machine can be, stands AI-augmented human intelligence (AHI), which asks how much intelligence a machine can enable in a particular person. Realizing it calls for a new kind of system, a cognitive symbiont: a lifelong, embedded, real-time, private, low-friction, and proactive companion that senses what the person senses through external devices, keeps their context across years, models their situation and their mind, takes part in their thinking at the right moment, carries out everyday tasks with their context, and keeps learning the person as both change. We give the paradigm a conceptual core, the cognitive gap between what a person could bring to a situation and what they can hold in working memory, and organize its design space as a symbiosis loop of sensing, keeping, understanding, living alongside, acting for and thinking with the person, and growing, enclosed by a personal runtime and by trust. Because a symbiont changes what a person can do in front of others, it also raises risks of a new kind, from covert assistance in examinations to pressure on everyone to adopt it, and we treat their governance as part of the paradigm.