Llama 2: open source, free for research and commercial use

We're unlocking the power of these large language models. Our latest version of Llama – Llama 2 – is now accessible to individuals, creators, researchers, and businesses so they can experiment, innovate, and scale their ideas responsibly.

Download the Model

Available as part of the Llama 2 release

With each model download you'll receive:

Model code
Model Weights
README (User Guide)
Responsible Use Guide
License
Acceptable Use Policy
Model Card

Technical specifications

Llama 2 was pretrained on publicly available online data sources. The fine-tuned model, Llama-2-chat, leverages publicly available instruction datasets and over 1 million human annotations.

Read the paper

Inside the model

Llama 2 models are trained on 2 trillion tokens and have double the context length of Llama 1. Llama-2-chat models have additionally been trained on over 1 million new human annotations.

Benchmarks

Llama 2 outperforms other open source language models on many external benchmarks, including reasoning, coding, proficiency, and knowledge tests.

Safety and helpfulness

Reinforcement learning from human feedback

Llama-2-chat uses reinforcement learning from human feedback to ensure safety and helpfulness.

Training Llama-2-chat: Llama 2 is pretrained using publicly available online data. An initial version of Llama-2-chat is then created through the use of supervised fine-tuning. Next, Llama-2-chat is iteratively refined using Reinforcement Learning from Human Feedback (RLHF), which includes rejection sampling and proximal policy optimization (PPO).

Our model and weights are licensed for both researchers and commercial entities, upholding the principles of openness. Our mission is to empower individuals, and industry through this opportunity, while fostering an environment of discovery and ethical AI advancements.

Like all LLMs, Llama 2 is a new technology that carries potential risks with use. Testing conducted to date has not — and could not — cover all scenarios. In order to help developers address these risks, we have created the Responsible Use Guide. More details can be found in the Research paper and Model card.

Download the Model

Get Llama 2 now: complete the download form via the link below. By submitting the form you agree to Meta's privacy policy

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Responsibility

Responsible Use Guide: your resource for building responsibly

The Responsible Use Guide is a resource for developers that provides best practices and considerations for building products powered by large language models (LLM) in a responsible manner, covering various stages of development from inception to deployment.

Responsible Use Guide

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Resources

Explore more on Llama 2

Discover more about Llama 2 here — scroll through our resources, ranging from our research paper, how to get access, and more.