Llama 3.1 405B
LegacyMeta's largest open-weight model at 405B parameters.
Competitive with top proprietary models at time of release. Superseded by Llama 3.3 70B (same performance, much cheaper) and Llama 4.
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Llama 3.1 405B by Meta has a Capability Index of 62.7, making it below the field average in capability. It ranks #66 out of 92 models on the idapt capability leaderboard.
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Mistral Small 4vs Llama 3.1 405BFrequently Asked Questions about Llama 3.1 405B▼
Who created Llama 3.1 405B?
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Llama 3.1 405B was created by Meta.
How capable is Llama 3.1 405B?
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Llama 3.1 405B has a Capability Index of 62.7/100, making it below the field average in capability. It ranks #66 out of 92 models.
Is Llama 3.1 405B a reasoning model?
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No, Llama 3.1 405B is not a reasoning model. It responds directly without an extended internal thinking step. For tasks requiring deep chain-of-thought reasoning, consider models like Claude, o-series from OpenAI, or Gemini Thinking.
Does Llama 3.1 405B support image or vision input?
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No, Llama 3.1 405B does not currently support image or vision input. It is a text-only model.
Does Llama 3.1 405B support audio?
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No, Llama 3.1 405B does not support audio input.
Is Llama 3.1 405B open source?
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Llama 3.1 405B is a proprietary model developed by Meta. The model weights and training data are not publicly available.
Where can I use Llama 3.1 405B?
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You can chat with Llama 3.1 405B on idapt.app — no separate API key required. idapt is an AI workspace with 200+ models, agents, computers, and tasks. You can also access Llama 3.1 405B through Meta's own API or platform.