Glossary term
Glossary term
Foundations
Open-source LLMs are large language models that are freely available for anyone to use, customize, or deploy. They offer flexibility and transparency, making them a strong option for enterprises that want control over model behavior, cost, or deployment environment.
Meta Llama 4, Mistral Large, and Qwen 3 are widely deployed open-weight LLMs in 2026.
DeepSeek V3 and Yi from 01.AI are leading Chinese open-source LLMs.
The Allen Institute's OLMo and TII's Falcon are fully open LLMs with training data disclosed.