Open Source AI Showdown 2026: Llama 4 vs Gemma 4 vs DeepSeek V4 vs GLM-5.1

Open source AI models are beating paid models now. GLM-5.1 scored #1 on SWE-Bench Pro, ahead of Claude Opus 4.6 and GPT-5.4. And it's free under MIT license. As of April 2026, four open-source LLMs stand out. Here's how they compare. Quick Comparison Llama 4 Maverick Gemma 4 DeepSeek V4 GLM-5.1 Developer Meta Google DeepSeek Z.ai (Zhipu) Parameters 400B (17B active) 26B (3.8B active) ~1T (37B active) 744B (40B active) Context 1M tokens 256K 1M tokens — License Llama Li...