How AI Evolved From ChatGPT to Autonomous Agents: A Layer-by-Layer Explainer

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A student at an English school in Baguio, the Philippines, delivered a talk to classmates explaining how AI technology has progressed from ChatGPT's launch in November 2022 to the era of autonomous AI agents by 2026. The talk outlined key milestones, including the mainstream adoption of RAG for document-grounded answers, OpenAI's introduction of function calling, and Anthropic's Model Context Protocol standardizing tool access. A central theme was that large language models predict text rather than look up facts, making hallucination an inherent structural limitation rather than a fixable bug. Each subsequent development — reasoning models, agents, and reusable agent skills — was framed as a layer built to compensate for the constraints of the layer before it. The explainer was aimed at everyday ChatGPT users who have encountered terms like LLM, RAG, and MCP without a clear understanding of what they actually do.

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