Preface:
In 2023, when Meta released Llama 1, it was seen as opening Pandora's Box.
In 2025, looking back, we find that box wasn't a disaster, but the fire of Prometheus.

Today's open-source AI ecosystem has evolved from early "Llama fine-tuning" into a vast empire with an independent tech stack, independent business logic, and independent values. In certain vertical domains (like coding, math, healthcare), top-tier Open-Weights Models even outperform closed-source giants like GPT-5. This article dissects the evolutionary logic of this ecosystem.