Your AI can write sonnets, pass the bar exam and explain black holes. But ask it to clean up a messy folder? It might delete the wrong file and get stuck. That's why you need a harness – the system that tells AI models which tools to use, what to remember and how to recover when it screws up.

The model race isn't over – it's just not the only race anymore. Same brains, wildly different results. That's the power of harness.

While OpenAI, Anthropic and other developers provide end user-ready products, DeepSeek's approach is Lego‑style: every piece is a plugin. It's not a polished app – it's a box of parts. You don't just use it. You build your own.