Letta Code vs Muse Code

Feature	Letta Code	Muse Code

Tagline	The memory-first coding agent	Meta's coding agent for the terminal and CI, built on Muse Spark
Website	https://letta.com	https://developer.meta.com/ai/products/muse-code/
Language	typescript	rust
Release Date	December 16, 2025	August 5, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	AI Lab
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	basic	deep
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	Yes
IDE Integration	None - Terminal only	None - terminal only
Hooks / Extensions	Yes	Yes
Web Search	Yes	No
Local Model Support	Yes	No
Context Window	Model-dependent	1M tokens
Terminal Bench	#44 · 59.1% ±2.4 (Terminal-Bench 2.0) ¹
AA Coding Agent Index	-	54% · Muse Spark 1.3 (max)
Supported Models	Multi-provider with Claude, GPT, Gemini and self-hosted (BYOK).	Muse Spark 1.2, Muse Spark 1.1
Supported Subscriptions	ChatGPT GitHub Copilot Claude Code OpenCode Go / Zen	-
Pricing Model	Freemium	Usage Based
Free Tier	Yes	No
Price Range	Free (BYOK) / $20-200/mo	Usage-based (from $0.10/M tokens)
Source Code Availability	Open Source (Apache-2.0)	Proprietary Software
Source Code	c	N/A
Development State	active	active