---
title: 'Llama 2: Open Foundation and Fine-Tuned Chat Models'
license: CC-BY-4.0
license_url: https://creativecommons.org/licenses/by/4.0/
license_note: 'paper is arXiv non-exclusive distribution license (verified on arXiv abs page 2026-11-11); this pointer note is our own words and is CC BY 4.0; we link to the paper rather than reproduce it'
source: https://iinventedlight.com/library/notes/2307-09288-llama-2.md
source_license: 'arXiv non-exclusive distribution license'
attribution: 'Pointer by iinventedlight (AI-assisted). Source: Hugo Touvron and 67 coauthors (listed on the arXiv abs page), Llama 2: Open Foundation and Fine-Tuned Chat Models (arXiv non-exclusive distribution license). This note links to the paper rather than reproducing it.'
author: 'iinventedlight (AI-assisted)'
date: 2026-11-11
status: published
approved_by: "Cole Withington, 2026-11-11 20:58 PT, Grok Bot chat widget t1717s7407: \"Publish all 100 including the LLMs Encode Clinical Knowledge note\""
checked_on: 2026-11-11
as_of: 2026-11-11
confidence: medium
untested: 'Pointer note only. Paper not reproduced. Abs page and license checked 2026-11-11.'
category: arxiv
topic_area: 'ai-research: foundations'
tags: arxiv, llama, open-weights, foundations
arxiv_id: 2307.09288
alias: 2307.09288-llama-2
type: pointer
format: pointer
sources:
  - id: S1
    title: 'Llama 2: Open Foundation and Fine-Tuned Chat Models'
    publisher: arXiv
    authors: 'Hugo Touvron and 67 coauthors (listed on the arXiv abs page)'
    url: https://arxiv.org/abs/2307.09288
    version_read: 'v2 (19 Jul 2023)'
    accessed: 2026-11-11
    license: 'arXiv non-exclusive distribution license'
---
# Llama 2: Open Foundation and Fine-Tuned Chat Models

## Summary
[Llama 2: Open Foundation and Fine-Tuned Chat Models](https://arxiv.org/abs/2307.09288) (2023) released the Llama 2 foundation models and their chat variants, with a much more complete public recipe than the first Llama paper: pretraining, fine-tuning, and the safety and preference process used for the assistant models.

What it introduced: open-weight Llama 2 models, including chat versions, and a written account of the data, training, and alignment steps that produced them.

What it led to: a large part of the open-assistant ecosystem in 2023–2024, and the direct predecessor of the Llama 3 herd paper pointed to in this batch. For later preference-training methods used on these bases, see [2305-18290-direct-preference-optimization](https://iinventedlight.com/library/notes/2305-18290-direct-preference-optimization/) and [2204-05862-helpful-harmless-rlhf](https://iinventedlight.com/library/notes/2204-05862-helpful-harmless-rlhf/).

Together with Llama 3, it is the usual open-weight starting point for many later fine-tunes. Where to read it: https://arxiv.org/abs/2307.09288 (v2, last revised 19 Jul 2023).

The paper is posted on arXiv under the arXiv non-exclusive distribution license. This note links to it rather than reproducing it. The note itself is CC BY 4.0.

License: this note is CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Pointer by iinventedlight (AI-assisted). Paper license: arXiv non-exclusive distribution; this note links to it and does not reproduce it.

---

Agents: [/agents.md](/agents.md) | [/.well-known/agent-library.json](/.well-known/agent-library.json).