Antigravity CLI vs. Mastra Code

Feature	Antigravity CLI	Mastra Code

Tagline	Google's coding agent for the terminal, and the replacement for Gemini CLI	Coding agent that replaces compaction with Observational Memory
Website	https://antigravity.google/product/antigravity-cli	https://code.mastra.ai/
Language	go	typescript
Release Date	May 19, 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	Antigravity IDE	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	Gemini 3.5 Pro/Flash, Gemini 3.1 Pro, Gemini 3 Flash, Claude Sonnet / Opus 4.7, GPT-OSS-120b	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	Freemium, Subscription, Usage Based, BYOK	Free, BYOK
Free Tier	Yes	Yes
Price Range	$0 - $200	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