OpenAI's coding agent across CLI, IDE extension, ChatGPT and cloud, with automatic PR review.
WebsiteProvisional comparison
OpenAI Codex vs Gemini CLI
OpenAI Codex is provisional S-tier and Gemini CLI is provisional A-tier on Terminal Coding Agents. Rankings are never for sale.
Full Terminal Coding Agents tier list
Google's open-source AI agent that brings Gemini into the terminal.
Website| Field | OpenAI Codex | Gemini CLI |
|---|---|---|
| Tier | S · provisional | A · provisional |
| Why | Open-source CLI (129k+ stars) plus first-party OpenAI models, included in ChatGPT plans. | Open-source with a generous free tier; 107k+ GitHub stars. |
| Pricing | included in ChatGPT plans · starts at $20/mo (ChatGPT Plus) | open-source / free tier |
| GitHub stars | 129,388 | 107,390 |
| Last push | Oct 15, 2026 | Oct 15, 2026 |
| Last verified | Oct 15, 2026 | Oct 15, 2026 |