Codex CLI vs Gemini 3.8 Flash
A side-by-side comparison of features, pricing, and characteristics.
Codex CLI
An open-source, terminal-based AI coding agent by OpenAI that automates repository tasks, reviews pull requests, and runs tests in sandboxed environments.
Read the full reviewGemini 3.8 Flash
Google stable Flash model for long-horizon software engineering and autonomous agents.
Read the full review| Attribute | Codex CLI | Gemini 3.8 Flash |
|---|---|---|
| Pricing type | Free + paid (from $20/mo) | Paid |
| Korean support | No | No |
| Platforms | macOS, Linux, Windows (WSL2) | - |
| Open source | Yes | No |
| API available | - | Available |
| SDK | - | - |
| LLM-based | - | - |
| Multimodal | - | - |
| AI model | GPT, Codex | - |
| GitHub Stars | 122.0K | - |
| Vendor | OpenAI | - |
| Category | Developer Tools | Developer Tools |
| Details | View | View |
Codex CLI key features
- Terminal-based execution (CLI)
- Execution in an isolated cloud sandbox
- Natural language-based code generation and editing
- Automated testing and debugging loop
- Git and GitHub workflow integration (automatic PR generation)
- Custom skill expansion (SKILL.md)