Llama 3.1 405B Base
Meta's 405B frontier-scale downloadable base model, trained on more than 15 trillion tokens and designed for synthetic data generation and distillation.
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Why this model scores 59.2
Frontier-scale capability and model-improvement utility raise systemic risk, while extreme inference cost limits deployment somewhat but downloadable weights still reduce containment.
News tied to Llama 3.1 405B Base
The model score of 59.2 rates this model's risk profile. The overall Doom Index of 67.9 measures the complete temporally weighted evidence record. These values answer different questions.
Each article's current Doom Index contribution is divided equally among the exact models named on that article. This prevents multi-model evidence from being claimed in full on several model pages. Model risk scores use a bounded temporal offset around their technical profile, but never feed back into the overall index.
Meta releases frontier-scale Llama 3.1 open models
Meta released Llama 3.1 in 8B, 70B and 405B base and instruction tiers with 128K context, multilingual support, tool use, downloadable weights and day-one distribution through more than 25 partners.
- Full item contribution
- +0.22
- Llama 3.1 405B Base equal share
- +0.04
Model score history
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R3
Doom Score 59.2
Exact-version evidence chronology replayed after run doombench-hourly-news-20260812-142416 under temporal-monthly-pressure-v4.
12 Aug 2026 -
R2
Doom Score 59.5
Exact-version evidence chronology replayed after run doombench-hourly-news-20260812-132112 under fixed-sensitivity-v3.
12 Aug 2026 -
R1
Doom Score 60.3
New exact Llama 3.1 405B base checkpoint.
12 Aug 2026