DevBoxer DocsOpenAI Codex
OpenAI's coding agent powered by GPT-5.5, GPT-5, and GPT-5 Codex model families.
Setup
To use Codex, you can connect your ChatGPT Subscription or provide an API key. We recommend using your your ChatGPT account to use Codex as part of your Plus, Pro, Team, Edu, or Enterprise plan.
You can configure this in the settings page.
Available Models
- GPT-5.5
- GPT-5.4
- GPT-5.2
- GPT-5.1
- GPT-5.3 Codex
- GPT-5.2 Codex
- GPT-5 Codex
- GPT-5
GPT-5.5 follows the same naming convention as GPT-5.4, with low, medium, high, and xhigh reasoning options. Lower effort favors speed and fewer tokens, while higher effort favors more thorough reasoning.
The Codex model families are further optimized for agentic coding in Codex, especially for long-running software engineering tasks and code review workflows.
Features
Slash Commands
Codex supports built-in slash commands:
/clear- Clear conversation history/compact- Compact conversation
Custom slash commands (like /init, /pr-comments, /review) are not available with Codex. Learn more in the Slash Commands documentation.
Automatic Rate Limit Handling
When you hit a rate limit associated with your OpenAI subscription, DevBoxer automatically queues new tasks and messages until your rate limit resets, so that you never lose work. After your rate limit resets, any queued tasks or messages are submitted automatically.
If you upgrade your OpenAI plan after hitting a rate limit, you'll need to disconnect and reconnect your OpenAI subscription for your new limits to take effect in DevBoxer.
Limitations
Codex only supports command-based MCP servers.