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Codex vs OpenCode
Codex is OpenAI's agent that comes with ChatGPT; OpenCode is open source and works with many model providers, and can even sign in with ChatGPT Plus or Pro.
At a glance
| Fact | Codex | OpenCode |
|---|---|---|
| Made by | OpenAI | Anomaly |
| What it is | OpenAI's coding agent for writing, reviewing and shipping code. | An open-source coding agent for the terminal, coding editors and desktop. |
| Price | Included with ChatGPT plans, with limits on Free | OpenCode includes free models, or you can connect your own provider. Optional Go is $10 a month and Go Plus $40 a month, with per-model usage limits. Provider costs are separate |
| Runs on | macOS, Windows, Linux, Web, CLI | CLI, macOS, Windows, Linux |
| Open source | No | Yes |
| Models | Not stated | Claude, GPT, Gemini |
| Last verified | October 14, 2026 | October 14, 2026 |
| Official site | openai.com/codex | opencode.ai |
Where they differ
- Price: Codex is included with ChatGPT plans; OpenCode includes free models, with optional plans from $10/month.
- Open source: OpenCode is; Codex isn't.
- Extras: Codex runs cloud tasks and reviews PRs automatically; OpenCode has multi-session agents and share links.
Which to pick
Choose Codex if you want OpenAI's cloud tasks and PR reviews.
Choose OpenCode if you want an open-source agent that works with many providers.
Keep looking
- Codex listing
- OpenCode listing
- Codex alternatives
- OpenCode alternatives
- Claude Code vs Codex
- Claude Code vs OpenCode
- Codex vs Cursor
- Codex vs GitHub Copilot
Facts from each maker's official pages, last verified October 14, 2026. How we verify.