Deep Agents CLI vs. fx (by Vercel)

Feature	Deep Agents CLI	fx (by Vercel)

Tagline	A pre-built coding agent powered by any LLM with tool calling	Tiny, open, embeddable, native coding agent by Vercel.
Website	https://docs.langchain.com/deepagents	https://fx.sh
Language	python	zig
Release Date	October 19, 2025	August 17, 2026
Last Updated	June 29, 2026	August 19, 2026
Provider Type	Independent	Independent
MCP Support	Yes	Yes
Multi-Agent Support	Yes	No
Git Integration	basic	minimal
Multi-File Editing	Yes	Yes
Auto Test Running	No	No
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	No	Yes
Voice Mode	No	No
IDE Integration	None - terminal only
Hooks / Extensions	Yes	No
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model-dependent; compression at threshold	Model dependent
Terminal Bench 2.0	#29 · 66.5% ±3.1 ¹
Supported Models	Any LangChain model: Claude, GPT-5, Gemini, DeepSeek, Ollama, Groq, xAI	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc
Supported Subscriptions	ChatGPT	—
Pricing Model	BYOK	Free, BYOK, Usage Based
Free Tier	Yes	No
Price Range	Free (BYOK)	0 - $20 / mo / Custom (Vercel AI Gateway)
Source Code Availability	Open Source (MIT)	Open Source (Apache-2.0)
Source Code	https://github.com/langchain-ai/deepagents	https://github.com/vercel-labs/fx
Development State	active	active