Karpathy's Third UI Paradigm and What GPT-5.6 Sol Tells Us

Andrej Karpathy named something important this week: AI is entering its third UI paradigm, moving from chatbots to standalone apps to persistent, asynchronous team members. Meanwhile OpenAI previewed GPT-5.6 Sol, Simon Willison ran a real security experiment with 2,000 attackers, and LangChain published how Deep Agents cuts LLM costs by up to 80% through prompt caching.