Llama 3.1 405B vs Llama 4
Llama 4 superior; 3.1 405B remains useful for specific fine-tuning lineages.
Llama 3.1 405B
The model that first made the open-weights vs. closed-source comparison uncomfortable for the labs.
Use this when
Existing fine-tunes based on 3.x lineage, specific benchmark compatibility.
Full profile →Llama 4
Meta's fourth Llama generation. Three sizes, all-MoE, the open-weights default for serious self-hosters.
Use this when
New deployments; Llama 4 MoE architecture more efficient at scale.
Full profile →Cost comparison
Both free self-hosted. Llama 4 MoE requires less VRAM per effective parameter.