Meta released Llama 3.1 in three sizes. The 405B model was the headline: the first openly available model that traded blows with leading closed models on many tests.
AI model data sheet: Llama 3.1 405B
| Developer | Meta |
|---|---|
| Released | July 23, 2024 |
| Type | Dense large language model (also 8B and 70B) |
| Context window | 128K tokens |
| Access | Download, cloud providers and Meta AI |
| Licence / weights | Open weights under the Llama community licence |
| Best at | Frontier-level quality you can host yourself |
| Why it matters | The largest openly available model at launch |
Quick verdict: The open-weights flagship of 2024. Check licence terms before commercial use.
Running it takes serious hardware, so most people use the 8B and 70B versions or a hosting provider.