Antigravity CLI vs fx (by Vercel)

Feature	Antigravity CLI	fx (by Vercel)

Tagline	Google's coding agent for the terminal, and the replacement for Gemini CLI	Tiny, open, embeddable, native coding agent by Vercel.
Website	https://antigravity.google/product/antigravity-cli	https://fx.sh
Language	go	zig
Release Date	May 19, 2026	August 17, 2026
Last Updated	September 27, 2026	August 19, 2026
Provider Type	AI Lab	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	No
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	No
IDE Integration	Antigravity IDE	None - Terminal only
Hooks / Extensions	Yes	No
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent	Model-dependent
AA Coding Agent Index	42% · Gemini 3.8 Flash (high)	-
Supported Models	Gemini 3.5 Pro/Flash, Gemini 3.1 Pro, Gemini 3 Flash, Claude Sonnet / Opus 4.7, GPT-OSS-120b	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc
Pricing Model	Freemium, Subscription, Usage Based, BYOK	Free, BYOK, Usage Based
Free Tier	Yes	No
Price Range	$0 - $200	0 - $20 / mo / Custom (Vercel AI Gateway)
Source Code Availability	Proprietary Software	Open Source (Apache-2.0)
Source Code	N/A	https://github.com/vercel-labs/fx
Development State	active	active