Why Humanoid Robots Are So Hard to Build
Humanoid robots promise to work in spaces built for people. Making them balance, grip and run all day safely is one of the toughest problems in engineering.
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Supervised vs Unsupervised Learning, Explained
Supervised learning trains on labeled examples to make predictions. Unsupervised learning finds structure in unlabeled data. Most real AI systems combine both.
GPT-6.1 Terra: OpenAI's New Mid-Tier Model for Computer Use and Writing
OpenAI released GPT-6.1 Terra on October 26, 2026, a model aimed at visual reasoning, computer use and writing. It is in the API and Codex, but not in the ChatGPT Chat tab.
OpenAI Rolls Out GPT-6 With 'Intelligent UI' in ChatGPT
OpenAI began rolling out GPT-6 to ChatGPT on October 7, 2026, with an Intelligent UI that lets the model build interactive answers. Free users got it a day later.
What Is Retrieval-Augmented Generation (RAG)? A Plain-English Guide
RAG lets an AI model search your documents before it answers. It is cheaper than retraining and easier to check, but only as good as the search behind it.