fx (by Vercel) vs. Vix

Feature	fx (by Vercel)	Vix

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	Sleek, Fast and Token Efficient AI Coding Agent
Website	https://fx.sh	https://getvix.dev
Language	zig	go
Release Date	August 17, 2026	June 1, 2026
Last Updated	August 19, 2026	June 28, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	minimal	shallow
Multi-File Editing	Yes	No
Auto Test Running	No	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
IDE Integration		N/A
Hooks / Extensions	No	Yes
Web Search	Yes	Yes
Local Model Support	Yes	No
Context Window	Model dependent	Model Dependent
Terminal Bench 2.0		#1 · 90.0% ±2.1 ²
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	Anthropic Models (Opus 4.8 / 4.7 / 4.6), OpenAI (GPT-5.1 / o3 / 4o), MiniMax, Xiaomin MiMo and 300+ Models on OpenRouter.
Supported Subscriptions	—	Claude Code ChatGPT
Pricing Model	Free, BYOK, Usage Based	Free
Free Tier	No	No
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	$0
Source Code Availability	Open Source (Apache-2.0)	Open Source (AGPL-3.0)
Source Code	https://github.com/vercel-labs/fx	https://github.com/kirby88/vix
Development State	active	active