fx (by Vercel) vs. Keen Code

Feature	fx (by Vercel)	Keen Code

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	Terminal coding agent in Go with a deliberately lean tool set
Website	https://fx.sh	https://mochow13.github.io/keen-code/
Language	zig	go
Release Date	August 17, 2026	February 16, 2026
Last Updated	August 19, 2026	September 4, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	No	Yes
Git Integration	basic	basic
Multi-File Editing	Yes	Yes
Auto Test Running	No	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	No
Voice Mode	No	No
IDE Integration	None - Terminal only	None - terminal only
Hooks / Extensions	No	No
Web Search	Yes	No
Local Model Support	Yes	Yes
Context Window	Model-dependent	Model-dependent; auto-compaction
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	Anthropic, OpenAI, Codex via ChatGPT OAuth, Google AI, Moonshot Kimi, Z.ai GLM, DeepSeek, MiniMax, Amazon Bedrock, OpenCode Go, plus any OpenAI-compatible endpoint
Supported Subscriptions	—	ChatGPT
Pricing Model	Free, BYOK, Usage Based	Free, BYOK
Free Tier	No	Yes
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	Free (BYOK)
Source Code Availability	Open Source (Apache-2.0)	Open Source (MIT)
Source Code	https://github.com/vercel-labs/fx	https://github.com/mochow13/keen-code
Development State	active	active