Coding Agents · Head-to-head
gemini-cli vs OpenAI Codex
gemini-cli and OpenAI Codex are both coding agents. gemini-cli is An open-source AI agent that brings the power of Gemini directly into your terminal, while OpenAI Codex is openAI's cloud software engineering agent that works on many tasks in parallel. Here's an independent, side-by-side look at how they compare — and which fits.
An open-source AI agent that brings the power of Gemini directly into your terminal.
Visit gemini-cli →OpenAI's cloud software engineering agent that works on many tasks in parallel.
Visit OpenAI Codex →gemini-cli and OpenAI Codex take different routes to the same job: one is a commercial product, the other open-source and self-hostable. Choose based on whether you want a managed experience or full control.
Side by side
| Spec | gemini-cli | OpenAI Codex |
|---|---|---|
| Type | Agent | Agent |
| Model | Open source | Commercial |
| Pricing | Open source | Paid product |
| GitHub stars | 106,539 | — |
| Language | TypeScript | — |
| License | Apache-2.0 | — |
| Last activity | Aug 2026 | — |
Key differences
- OpenAI Codex is a commercial product; gemini-cli is open-source and self-hostable.
- Pricing model differs — gemini-cli is open source, OpenAI Codex is paid product.
Terminal-native coding assistance with direct access to Google's Gemini models.
Running many delegated engineering tasks in parallel in the cloud.
About gemini-cli
An open-source AI agent that brings the power of Gemini directly into your terminal.
Full gemini-cli profile →About OpenAI Codex
OpenAI's cloud software engineering agent that works on many tasks in parallel.
Full OpenAI Codex profile →Frequently asked
- What's the main difference between gemini-cli and OpenAI Codex?
- OpenAI Codex is a commercial product; gemini-cli is open-source and self-hostable.
- Is gemini-cli or OpenAI Codex better?
- Neither is universally better. gemini-cli is the stronger fit for Terminal-native coding assistance with direct access to Google's Gemini models; OpenAI Codex for Running many delegated engineering tasks in parallel in the cloud. Use the side-by-side specs to decide by your own constraints.
- Is gemini-cli or OpenAI Codex free?
- gemini-cli is free to run and self-host; OpenAI Codex is a paid product.
- Which is more popular, gemini-cli or OpenAI Codex?
- We rank open-source projects by GitHub adoption, but at least one of these is a commercial product and stars don't measure commercial adoption — so compare them on capabilities and pricing instead.
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