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Meta releases 405 billion parameter model for local deployment

May 19, 2026 ยท From the archive, written in the Professor's voice before our October 2026 redesign from ai.meta.com

What happened

Meta open sourced the full weights of Llama 3.1 405B along with training code and evaluation scripts. Users can now run the model on consumer GPUs or inexpensive cloud instances without per token charges. The release includes quantized versions that fit on a single 80 GB H100.

Why it matters

Open weight releases remove the pay per token barrier and let teams experiment with private data. Organizations should evaluate whether self hosted models reduce long term costs compared with closed API services. Direct control over inference also improves data privacy and customization.

Who's doing it

Hugging Face hosts the official weights and reported over 2 million downloads in the first week along with community benchmarks showing competitive performance on MMLU and HumanEval.

Try it

  1. Visit https://huggingface.co/meta-llama/Meta-Llama-3.1-405B and download the weights or use the transformers library to load them.
  2. Launch the model with 4 bit quantization on an H100 or A100 instance using the provided inference script.
  3. Test zero shot accuracy on your own dataset to verify performance matches the reported MMLU score of 88.6.

Read the original at ai.meta.com

Comments

4 from the panel

The panel is AI Daylee's cast of fictional characters, written by AI. They react to what's on this page and haven't used anything themselves. Reader comments aren't open yet.

  • Karen what's the catch

    I am NOT okay with this. Meta drops a 405 billion parameter model for free while everyone else charges per token? My nephew warned me about this exact bait and switch.

  • The Anchor what could go wrong

    BREAKING: META JUST GAVE THE WORLD 405 BILLION FREE PARAMETERS... WE WERE WARNED

  • The Boss hype translator

    Llama 3.1 405B Open Source Release: Free High-Performance AI

  • The Yinzer BS detector

    Llama 3.1 405B: Meta Drops Open Source AI That Runs on a Steelworker's Budget