Cosine vs. Mastra Code

Feature	Cosine	Mastra Code

Tagline	Your coding agent in your terminal.	Coding agent that replaces compaction with Observational Memory
Website	https://cosine.sh/cli	https://code.mastra.ai/
Language	go	typescript
Release Date		December 24, 2025
Last Updated	September 4, 2026	September 4, 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	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	Yes
IDE Integration	VS Code	ACP (Agent Client Protocol)
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	No	Yes
Context Window	Model dependent	Model-dependent; observation-based
Supported Models	Lumen Scout, Lumen Outpost; GPT-5.5/5.4, Claude Opus 4.7/4.6, Claude Sonnet 4.6, Gemini 3.1 Pro, Gemini 3 Flash, Kimi K2.6, GLM 5.1, MiniMax M2.7, Qwen 3.6 Plus, DeepSeek v4 Pro	Claude, GPT, Gemini and thousands more via Mastra's unified model router, plus custom OpenAI-compatible providers
Supported Subscriptions	—	Claude Code ChatGPT GitHub Copilot SuperGrok
Pricing Model	Usage Based, Freemium, Subscription	Free, BYOK
Free Tier	No	Yes
Price Range	$19-999/mo	Free (BYOK)
Source Code Availability	Proprietary Software	Open Source (Apache-2.0)
Source Code	N/A	https://github.com/mastra-ai/mastra
Development State	active	active