fx (by Vercel) vs. Kiro CLI

Feature	fx (by Vercel)	Kiro CLI

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	AI coding agent by Amazon
Website	https://fx.sh	https://kiro.dev/cli
Language	zig	rust
Release Date	August 17, 2026	November 17, 2025
Last Updated	August 19, 2026	April 28, 2026
Provider Type	Independent	AI Lab
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	minimal	deep
Multi-File Editing	Yes	Yes
Auto Test Running	No	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
Hooks / Extensions	No	Yes
Web Search	Yes	Yes
Local Model Support	Yes	No
Context Window	Model dependent	Not disclosed
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	Frontier and open weight models with auto routing: Opus / Sonnet 4.6, MiniMax 2.5, DeepSeek 3.2, Qwen3.
Pricing Model	Free, BYOK, Usage Based	Freemium
Free Tier	No	Yes
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	Free / $0-200/mo
Source Code Availability	Open Source (Apache-2.0)	Proprietary Software
Source Code	https://github.com/vercel-labs/fx	N/A
Development State	active	active