Keen Code vs Letta Code

Feature	Keen Code	Letta Code

Tagline	Terminal coding agent in Go with a deliberately lean tool set	The memory-first coding agent
Website	https://mochow13.github.io/keen-code/	https://letta.com
Language	go	typescript
Release Date	February 16, 2026	December 16, 2025
Last Updated	September 4, 2026	August 19, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	Yes
Git Integration	basic	basic
Multi-File Editing	Yes	Yes
Auto Test Running	Yes	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	No	Yes
Voice Mode	No	No
IDE Integration	None - terminal only	None - Terminal only
Hooks / Extensions	No	Yes
Web Search	No	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent; auto-compaction	Model-dependent
Terminal Bench		#44 · 59.1% ±2.4 (Terminal-Bench 2.0) ²
Supported Models	Anthropic, OpenAI, Codex via ChatGPT OAuth, Google AI, Moonshot Kimi, Z.ai GLM, DeepSeek, MiniMax, Amazon Bedrock, OpenCode Go, plus any OpenAI-compatible endpoint	Multi-provider with Claude, GPT, Gemini and self-hosted (BYOK).
Supported Subscriptions	ChatGPT	ChatGPT GitHub Copilot Claude Code OpenCode Go / Zen
Pricing Model	Free, BYOK	Freemium
Free Tier	Yes	Yes
Price Range	Free (BYOK)	Free (BYOK) / $20-200/mo
Source Code Availability	Open Source (MIT)	Open Source (Apache-2.0)
Source Code	https://github.com/mochow13/keen-code	c
Development State	active	active