LLMOpen weights
Llama 3.1 405B
Meta
Updated May 21, 2026 · Benchmarks via Artificial Analysis, specs & pricing via OpenRouter · Methodology · Report an error
Specifications
- Type
- LLM
- Access
- Open weights
- Released
- July 23, 2024
- License
- Llama 3.1 Community License
- Parameters
- 405B
- Context window
- 128,000 tokens
- Input
- Text
- Output
- Text
Benchmarks
General
| MMLU | 88.6 |
Our take
The first open-weights model to credibly match the leading closed frontier models on general benchmarks — a landmark for open AI and a reference point for every open release since.