Meta releases Llama 3.1 with a 405-billion-parameter model

Meta released Llama 3.1 on 23 July 2024, including a 405-billion-parameter model it called the largest openly available foundation model to date, with a 128,000-token context window. Meta said it matched GPT-4o and Claude 3.5 Sonnet on knowledge, math, and tool-use benchmarks.

Why it mattered A model anyone could download, reported at parity with closed frontier models on benchmarks, put pressure on what the makers of proprietary models could charge for access.