fx vs. OpenCode Comparison


fx Vercel	OpenCode Anomaly Innovations	+	+
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About fx is a tiny, open, native coding agent harness and CLI written in Zig, optimized for research, performance, and embeddability as part of larger systems. Its design focuses on minimalism across the system prompt, tools, feature set, memory use, and a 6 MB binary, with an interface intended to feel closer to a Unix shell than a heavy terminal IDE. fx cold starts in microseconds and performs no unnecessary work or I/O before accepting input, making it suitable for programmatic use, resource-constrained environments, and agent sandboxes. Developers can start it inside a project and ask it to read files, search code, run commands, make changes, execute tests, and stream tool calls as they happen. The core is model- and provider-agnostic, supporting local models, gateways, direct provider access, and cloud inference. It is context-efficient by design, using a minimal system prompt and toolset to reduce token overhead and improve time to first token.	About OpenCode is the AI coding agent purpose-built for the terminal. It delivers a responsive, themeable terminal UI that feels native while streamlining your workflow. With LSP auto-loading, it ensures the right language servers are always available for accurate, context-aware coding support. Developers can spin up multiple AI agents in parallel sessions on the same project, maximizing productivity. Shareable links make it easy to reference, debug, or collaborate across sessions. Supporting Claude Pro and 75+ LLM providers via Models.dev, OpenCode gives you full freedom to choose your coding companion.
Platforms Supported Windows Not Supported Mac Not Supported Linux Not Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported	Platforms Supported Windows Supported Mac Supported Linux Supported Cloud Supported On-Premises Not Supported iPhone Not Supported iPad Not Supported Android Not Supported Chromebook Not Supported
Audience Developers and AI infrastructure builders in need of a solution to run or embed a lightweight, extensible, model-agnostic coding agent in terminals, applications, and automated systems	Audience OpenCode is built for developers who want an AI coding agent that’s fast, collaborative, and native to the terminal
Support Phone Support Not Supported 24/7 Live Support Not Supported Online Supported	Support Phone Support Not Supported 24/7 Live Support Not Supported Online Not Supported
API Offers API Not Supported	API Offers API Not Supported
Screenshots and Videos View more images or videos	Screenshots and Videos View more images or videos
Pricing Free Free Version Supported Free Trial Not Supported	Pricing Free Free Version Supported Free Trial Not Supported
Reviews/Ratings Overall 0.0 / 5 ease 0.0 / 5 features 0.0 / 5 design 0.0 / 5 support 0.0 / 5 This software hasn't been reviewed yet. Be the first to provide a review: Review this Software	Reviews/Ratings Overall 5.0 / 5 ease 5.0 / 5 features 5.0 / 5 design 4.5 / 5 support 4.5 / 5 Read all reviews
	Pros & Cons from Real Users Pros OpenCode feels like a strong fit for developers who want an AI coding agent without getting locked into one model or one editor. I like that it works in the terminal, desktop, and IDE, so it can fit into different workflows instead of forcing one setup. The model flexibility is a big win. Being able to use 75+ providers, local models, GitHub Copilot, or ChatGPT Plus/Pro makes OpenCode feel more open and customizable than a lot of coding assistants. I also like the LSP support and multi-session workflow. For real coding work, it helps when the agent understands the project better and can run multiple threads of work in parallel. Easy to install Easy to use Free models available with nearly no limits New models commonly get added for free Cons OpenCode is still something I would supervise closely. Any coding agent that can modify files, reason through projects, and run workflows needs clear review, tests, and good developer judgment. CLI only
Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported	Training Documentation Supported Webinars Not Supported Live Online Not Supported In Person Not Supported
Company Information Vercel Founded: 2015 United States fx.sh/	Company Information Anomaly Innovations Founded: 2008 United States opencode.ai/
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Categories AI Coding Agents Supported	Categories Agentic AI Supported Agentic CLI Coding Tools Supported AI Coding Agents Supported AI Coding Assistants Supported

Integrations Claude Code Not Supported Claude Fable 5 Not Supported Claude Pro Not Supported Claude Sonnet 4.5 Not Supported GPT-5.1 Instant Not Supported Gemini 3 Flash Not Supported Gemini 3.1 Flash-Lite Not Supported Gemma 4 Not Supported HOL Guard Not Supported Kimchi Not Supported Kimi K2.5 Not Supported Kimi K2.6 Not Supported Muse Spark 1.2 Not Supported Muse Spark 1.3 Not Supported Nativ Not Supported Orca Not Supported Puter.js Not Supported Tencent Hy Not Supported boat Not Supported condense.chat Not Supported Show More Integrations	Integrations Claude Code Supported Claude Fable 5 Supported Claude Pro Supported Claude Sonnet 4.5 Supported GPT-5.1 Instant Supported Gemini 3 Flash Supported Gemini 3.1 Flash-Lite Supported Gemma 4 Supported HOL Guard Supported Kimchi Supported Kimi K2.5 Supported Kimi K2.6 Supported Muse Spark 1.2 Supported Muse Spark 1.3 Supported Nativ Supported Orca Supported Puter.js Supported Tencent Hy Supported boat Supported condense.chat Supported Show More Integrations View All 169 Integrations
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