Codex CLI vs Gemini CLI

Feature	Codex CLI	Gemini CLI
Tagline	Lightweight coding agent that runs in your terminal	An open-source AI agent that brings Gemini into your terminal
Website	https://openai.com/codex	https://geminicli.com
Language	rust	typescript
Release Date	April 30, 2025	June 24, 2025
Last Updated	June 29, 2026	June 29, 2026
Provider Type	AI Lab	AI Lab
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	deep	deep
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	Yes	Yes
IDE Integration	VS Code, Zed (via ACP)	Antigravity, VS Code, JetBrains IDEs (ACP), Zed (ACP)
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	1M tokens
Terminal Bench	#1 · 58.2% ±2.8 (Terminal-Bench 4.0) 1	#15 · 65.8% ±2.7 (Terminal-Bench 2.1) 2
AA Coding Agent Index	67% · GPT-6 Astra (max)	-
Supported Models	All frontier GPT, Codex models: GPT-5.6 Sol / Terra / Luna, GPT-5.5, GPT-5.4 pro, GPT-5.3-Codex, optional custom models.	Gemini 3.5 Flash, Gemini 3.1 Pro
Supported Subscriptions	ChatGPT	—
Pricing Model	Subscription	Free
Free Tier	No	Yes
Price Range	$20-200/mo	Free (1,000 req/day)
Source Code Availability	Open Source (Apache-2.0)	Open Source (Apache-2.0)
Source Code	https://github.com/openai/codex	https://github.com/google-gemini/gemini-cli
Development State	active	active

¹ Codex CLI tested with GPT-6 Astra on Terminal-Bench 4.0.

² Gemini CLI tested with Gemini 3 Pro on Terminal-Bench 2.1.