---
title: Codex
---


## Install

Install the [Codex CLI](https://developers.openai.com/codex/cli/):

```
npm install -g @openai/codex
```

## Usage with Ollama

<Note>Codex requires a larger context window. It is recommended to use a context window of at least 64k tokens.</Note>

### Quick setup

```
ollama launch codex
```

To configure without launching:

```shell
ollama launch codex --config
```

### Manual setup

To use `codex` with Ollama, use the `--oss` flag:

```
codex --oss
```

To use a specific model, pass the `-m` flag:

```
codex --oss -m gpt-oss:120b
```

To use a cloud model:

```
codex --oss -m gpt-oss:120b-cloud
```

### Profile-based setup

For a persistent configuration, add an Ollama provider and profiles to `~/.codex/config.toml`:

```toml
[model_providers.ollama-launch]
name = "Ollama"
base_url = "http://localhost:11434/v1"

[profiles.ollama-launch]
model = "gpt-oss:120b"
model_provider = "ollama-launch"

[profiles.ollama-cloud]
model = "gpt-oss:120b-cloud"
model_provider = "ollama-launch"
```

Then run:

```
codex --profile ollama-launch
codex --profile ollama-cloud
```
