Codex CLI vs. Letta Code

Feature	Codex CLI	Letta Code
Tagline	Lightweight coding agent that runs in your terminal	The memory-first coding agent
Website	https://openai.com/codex	https://letta.com
Language	rust	typescript
Release Date	April 30, 2025	December 16, 2025
Last Updated	May 14, 2026	May 14, 2026
Provider Type	AI Lab	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	deep	basic
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	Yes	No
IDE Integration	VS Code, Zed (via ACP)	None - terminal only
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	Model-dependent
Terminal Bench 2.0	#3 · 82.0% ±2.2 1	#44 · 59.1% ±2.4 2
Supported Models	All frontier GPT, Codex models: GPT-5.5, GPT-5.4, GPT-5.4 pro, GPT-5.3-Codex, optional custom models.	Multi-provider with Claude, GPT, Gemini and self-hosted (BYOK).
Pricing Model	Subscription	Freemium
Free Tier	No	Yes
Price Range	$20-200/mo	Free (BYOK) / $20-200/mo
Source Code Availability	Open Source (Apache-2.0)	Open Source (Apache-2.0)
Source Code	https://github.com/openai/codex	https://github.com/letta-ai/letta-code
Development State	active	active

¹ Codex CLI tested with GPT-5.5 on Terminal Bench v2.0.

² Letta Code tested with Claude Opus 4.5 on Terminal Bench v2.0.