> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ollama.com/llms.txt
> Use this file to discover all available pages before exploring further.

# ChatGPT Desktop

> Use Ollama models in ChatGPT Desktop.

ChatGPT Desktop includes Codex, OpenAI's desktop coding agent. Ollama adds compatible local and cloud models to Codex's model picker alongside ChatGPT's native models.

## Prerequisites

* Ollama v0.34.0 or newer

If ChatGPT is not installed, Ollama offers to download it during setup.

## Connect ChatGPT

1. Open the Ollama desktop app and select **Apps**.
2. Toggle **ChatGPT (Desktop)** to On.
3. Follow the setup prompts. If ChatGPT is already open, Ollama asks to restart it before the new models appear.
4. Open the ChatGPT desktop app and use Codex mode.

## Choose models

Open Ollama **Settings**, select **Apps**, then select ChatGPT. Choose up to five compatible local or cloud models and save your changes. Ollama asks to restart ChatGPT when a model change needs one.

## Disconnect ChatGPT

Open Ollama **Apps** and turn ChatGPT off. Ollama restores ChatGPT's connection settings and usual profile. If ChatGPT is open, Ollama asks to restart it so the change takes effect.

## Codex behavior and limits

* Only requests made with an Ollama model go to Ollama. ChatGPT's native models keep using their usual provider.
* Ollama models are for Codex mode. Regular Chat and voice keep using their usual ChatGPT connection.
* Codex manages sessions. Ollama routes model requests and compaction when Codex asks for it, but does not store ChatGPT sessions.
* Web search uses Ollama's web-search service when you use an Ollama model. It requires Ollama sign-in and is limited to three calls per response.

## Related integrations

* Use Codex from a terminal with [Codex CLI](/integrations/codex).
* Connect other desktop apps from [Claude Desktop](/integrations/claude-desktop).