One Useful Thing • 4712 implied HN points • 18 Feb 26
- Decide between three layers: models (the AI brain), apps (the interface you use), and harnesses (the systems that let the AI use tools and act autonomously).
- If you want real work done, pay for and select advanced models or "thinking/Pro" modes, because free/default chat models are optimized for casual talk and make more errors.
- The big shift is from chatbots to agentic harnesses that can complete multi-step tasks; harness choice now often matters more than model choice, so try agent tools (like code or document-focused harnesses) and manage the AI as it works.