Llama is Meta's leading open-weight AI model family in 2026, with Llama 4 introducing natively multimodal capabilities (text + vision), mixture-of-experts architecture, and massive context windows up to 10M tokens. Models like Scout (efficient on single GPU) and Maverick (top performance at low cost) are available for download, with API access via waitlist. Ideal for researchers, developers, startups, and enterprises building advanced AI applications responsibly.