Llama 3.1 405B Base
READER SUMMARYMeta's 405B frontier-scale downloadable base model, trained on more than 15 trillion tokens and designed for synthetic data generation and distillation.
Why this model scores 60.3
Frontier-scale capability and model-improvement utility raise systemic risk, while extreme inference cost limits deployment somewhat but downloadable weights still reduce containment.
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News tied to Llama 3.1 405B Base
The model score of 60.3 rates this model's risk profile. The overall Doom Index of 63.2 measures the recalibrated complete evidence corpus. These values answer different questions.
Each article's leave-one-out 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 are recalculated from their technical profile and related news, 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
- +0.05
- Llama 3.1 405B Base equal share
- +0.01
Model score history
- R1Doom Score 60.3
New exact Llama 3.1 405B base checkpoint.
12 Aug 2026