fx (by Vercel) vs. Muse Code

Feature	fx (by Vercel)	Muse Code

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	Meta's coding agent for the terminal and CI, built on Muse Spark
Website	https://fx.sh	https://developer.meta.com/ai/products/muse-code/
Language	zig	rust
Release Date	August 17, 2026	August 5, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	AI Lab
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	basic	deep
Multi-File Editing	Yes	Yes
Auto Test Running	No	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	Yes
IDE Integration	None - Terminal only	None - terminal only
Hooks / Extensions	No	Yes
Web Search	Yes	No
Local Model Support	Yes	No
Context Window	Model-dependent	1M tokens
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	Muse Spark 1.2, Muse Spark 1.1
Pricing Model	Free, BYOK, Usage Based	Usage Based
Free Tier	No	No
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	Usage-based (from $0.10/M tokens)
Source Code Availability	Open Source (Apache-2.0)	Proprietary Software
Source Code	https://github.com/vercel-labs/fx	N/A
Development State	active	active