Llama 4 Scout is Meta's efficient multimodal language model featuring a mixture-of-experts architecture with 17 billion active parameters (109B total), delivering frontier-level performance at a fraction of the compute cost. Scout's groundbreaking 10 million token context window — the largest of any commercially available model — enables processing entire codebases, lengthy legal documents, and comprehensive research corpora in a single context. The model handles both text and images natively and is released under Meta's open license, enabling broad deployment.