AI models have plateaued on raw intelligence. The next gains come from what you build around them.
Lately, AI models seem to have reached a plateau in terms of raw intelligence gains. We are not seeing big leaps in reasoning capabilities just by making them bigger. This is making people feel AI is coming short of the expectations they had hoped for. To get more out of these LLMs, the conversation is quietly shifting toward a setup with a glue that puts this scattered language model into a helpful digital assistant. Also referred to as an AI agent harness.
If you think of the model as a brain, the AI harness is everything else: hands (tools) and memory that help do web search, use code editors, remember past actions, and fix mistakes. Involving humans when needed. Without it, you are mostly chatting with a bot. With an AI agent harness you can go deeper on researching a topic, debuggging code, and more.
Google recently launched its own version at Google I/O 2026 as Managed Agents in the Gemini API, where you can run the Antigravity agent in a secure cloud sandbox, build custom agents with your own instructions, skills, and data, and define them as versionable files using AGENTS.md and SKILL.md.
LangChain is another platform to map out actions into steps. There are other players offering different flavors like CrewAI and AutoGen. OpenAI released its Agents SDK (evolving from Swarm), offering lightweight orchestration, guardrails, tracing, and multi-agent handoffs that work well with their models. Anthropic powers strong agentic capabilities through its Claude Agent SDK and Computer Use tool, letting Claude directly interact with desktops via screenshots, mouse, and keyboard for real-world tasks.
This new paradigm is not flawless. When you have multiple agents and long-running tasks, cost can climb faster. They can still make mistakes and human input is sometimes needed. However, these are getting more robust over time.
AI agent harness is going to be the next space for AI giants to compete in. This requires building infrastructure that is resilient and reliable. At an individual level, building harness skills is going to be useful as it can directly translate into saving a corporation significant money through the next phase of automation.
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