---
title: OpenAI
---

Canonical URL: https://ghost.fail/openai

# OpenAI

**OpenAI** is an organization that develops AI models and serves them through [ChatGPT](/chatgpt) and the OpenAI API.

## Models

*Semantics: OpenAI tends to use the words "model" and "snapshot" to refer to [models](/models) (snapshots of weights), [families](/families) (sets of models), or aliases (which this website avoids making individual pages for).*

### Families

- [GPT-3](/families/gpt-3)
- [GPT-3.5](/families/gpt-3-5)
- [GPT-4](/families/gpt-4)
- [GPT-4o](/families/gpt-4o)
- [GPT-5](/families/gpt-5)
- [GPT-5.1](/families/gpt-5-1)
- [GPT-5.2](/families/gpt-5-2)
- [GPT-5.3](/families/gpt-5-3)
- [GPT-5.4](/families/gpt-5-4)
- [GPT-5.5](/families/gpt-5-5)
- [GPT-5.6](/families/gpt-5-6)

### All models

<ModelListTable provider="openai" />

## External links

### Developer API reference

- [Changelog | OpenAI API](https://developers.openai.com/api/docs/changelog)
- [All models | OpenAI API](https://developers.openai.com/api/docs/models/all)

### ChatGPT reference

- [Model Release Notes](https://help.openai.com/en/articles/9624314-model-release-notes#gpt-53-instant-update-march-3-2026) (OpenAI Help Center) - Lists changes to models in ChatGPT.
- [OpenAI | Wikipedia](https://en.wikipedia.org/wiki/OpenAI)