Keen Code vs. Mastra Code

Feature	Keen Code	Mastra Code

Tagline	Terminal coding agent in Go with a deliberately lean tool set	Coding agent that replaces compaction with Observational Memory
Website	https://mochow13.github.io/keen-code/	https://code.mastra.ai/
Language	go	typescript
Release Date	February 16, 2026	December 24, 2025
Last Updated	September 4, 2026	September 4, 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	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	No	Yes
Voice Mode	No	Yes
IDE Integration	None - terminal only	ACP (Agent Client Protocol)
Hooks / Extensions	No	Yes
Web Search	No	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent; auto-compaction	Model-dependent; observation-based
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	Claude, GPT, Gemini and thousands more via Mastra's unified model router, plus custom OpenAI-compatible providers
Supported Subscriptions	ChatGPT	Claude Code ChatGPT GitHub Copilot SuperGrok
Pricing Model	Free, BYOK	Free, BYOK
Free Tier	Yes	Yes
Price Range	Free (BYOK)	Free (BYOK)
Source Code Availability	Open Source (MIT)	Open Source (Apache-2.0)
Source Code	https://github.com/mochow13/keen-code	https://github.com/mastra-ai/mastra
Development State	active	active