Grok Build CLI vs. Mastra Code

Feature	Grok Build CLI	Mastra Code

Tagline	Bring Grok into your terminal	Coding agent that replaces compaction with Observational Memory
Website	https://x.ai/cli	https://code.mastra.ai/
Language	rust	typescript
Release Date	May 14, 2026	December 24, 2025
Last Updated	August 19, 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	None - Terminal only	ACP (Agent Client Protocol)
Hooks / Extensions	Yes	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	Model-dependent; observation-based
Supported Models	SuperGrok Heavy, Grok 4.5, 4.20, Grok 4, Grok Build 0.1, custom models including OpenAI compatible models	Claude, GPT, Gemini and thousands more via Mastra's unified model router, plus custom OpenAI-compatible providers
Supported Subscriptions	SuperGrok X Premium	Claude Code ChatGPT GitHub Copilot SuperGrok
Pricing Model	Subscription	Free, BYOK
Free Tier	Yes	Yes
Price Range	$0 (3 Day Trial) / $30 monthly (SuperGrok) / $300 monthly (SuperGrok Heavy)	Free (BYOK)
Source Code Availability	Open Source (EULA)	Open Source (Apache-2.0)
Source Code	https://github.com/xai-org/grok-build	https://github.com/mastra-ai/mastra
Development State	active	active