OpenAI's coding agent, available as CLI, IDE extension and cloud.
Coding agentspaid
OpenAI Codex vs Gemini CLI
Verdict: in our “Best terminal/CLI coding agent” ranking, OpenAI Codex ranks #2 and Gemini CLI ranks #3. The table compares their verified basics; how we rank.
| Feature | OpenAI Codex | Gemini CLI |
|---|---|---|
| What it is | OpenAI's coding agent, available as CLI, IDE extension and cloud. | Open-source AI agent that brings Gemini to the terminal. |
| Category | Coding agents | Coding agents |
| Pricing model | paid | open-source |
| Integrations | CLI, VSCode, MCP | CLI, MCP |
| Self-hostable | No / not listed | No / not listed |
| Open-source repo | openai/codex | google-gemini/gemini-cli |
| Rank in “Best terminal/CLI coding agent” | #2 | #3 |
| StackRank score | Not yet benchmarked | Not yet benchmarked |
| Last verified | Oct 14, 2026 | Oct 14, 2026 |
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Open-source AI agent that brings Gemini to the terminal.
Coding agentsopen-source