fx (by Vercel) vs. OpenBlock

Feature	fx (by Vercel)	OpenBlock

Tagline	Tiny, open, embeddable, native coding agent by Vercel.	A self-improving coding agent that handles the full dev lifecycle
Website	https://fx.sh	https://openblocklabs.com/
Language	zig	typescript
Release Date	August 17, 2026	March 16, 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	deep
Multi-File Editing	Yes	Yes
Auto Test Running	No	Yes
Sandbox / Permissions	Yes	Yes
Image / Multimodal Input	Yes	Yes
Voice Mode	No	No
IDE Integration		None - Terminal onle
Hooks / Extensions	No	Yes
Web Search	Yes	Yes
Local Model Support	Yes	Yes
Context Window	Model dependent	Model-dependent
Supported Models	All Vercel AI Gateway supported models, including OpenAI, Anthropic, Google, DeepSeek, z.AI, Moonshot, etc	400+ via OpenRouter (Claude, GPT, Gemini, Grok, open-source)
Pricing Model	Free, BYOK, Usage Based	Freemium
Free Tier	No	Yes
Price Range	0 - $20 / mo / Custom (Vercel AI Gateway)	$10-100 (credit-based)
Source Code Availability	Open Source (Apache-2.0)	Proprietary Software
Source Code	https://github.com/vercel-labs/fx	N/A
Development State	active	active