Letta Code vs. zerostack

Feature	Letta Code	zerostack

Tagline	The memory-first coding agent	Minimal Rust coding agent optimized for memory footprint
Website	https://letta.com	https://gi-dellav.github.io/zerostack/
Language	typescript	rust
Release Date	December 16, 2025	May 12, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	basic	deep
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
IDE Integration	None - Terminal only	Zed (via ACP), Neovim (via CodeCompanion.nvim + ACP)
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	Model-dependent; auto-compaction
Terminal Bench 2.0	#48 · 59.1% ±2.4 ¹
Supported Models	Multi-provider with Claude, GPT, Gemini and self-hosted (BYOK).	OpenRouter (default), OpenAI, Anthropic, Gemini, Ollama, plus unlimited custom OpenAI-compatible endpoints (vLLM, LiteLLM, enterprise gateways)
Supported Subscriptions	ChatGPT GitHub Copilot Claude Code OpenCode Go / Zen	—
Pricing Model	Freemium	Free, BYOK
Free Tier	Yes	Yes
Price Range	Free (BYOK) / $20-200/mo	Free (BYOK)
Source Code Availability	Open Source (Apache-2.0)	Open Source (GPL-3.0)
Source Code	c	https://github.com/gi-dellav/zerostack
Development State	active	active