Llama 3.1 405B

by Metaopen weights

Llama 3 family

Parameters

405B

Context window

128K tokens

Released

2024-07-23

Input price / 1M tok

$3.00

Output price / 1M tok

$3.00

Modality

tools

About Llama 3.1 405B

Meta's largest open-weight model — the model that made 'open frontier LLM' credible. GPT-4-tier benchmarks with fully released weights. Runs on cloud providers like Together, Fireworks, and Groq at meaningfully lower price than closed peers.

Strengths

Open weights
GPT-4-class benchmarks
Wide cloud availability
Predictable pricing

Weaknesses

Text-only
Weaker than Llama 4 on most tasks
Requires 8×H100 to self-host

Best for

On-prem RAGFine-tuningCost-sensitive production

Vendor page →HuggingFace →Paper / release →