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What is fx?

fx is a compact, open-source coding agent and command-line interface (CLI) crafted in Zig, tailored for research purposes, performance enhancement, and smooth integration into larger frameworks. Its design philosophy highlights minimalism across the system prompt, available functionalities, memory efficiency, and achieves a compact binary size of just 6 MB, striving for a user experience reminiscent of a Unix shell instead of a bulky terminal IDE. With an outstanding cold start time measured in microseconds, fx efficiently bypasses unnecessary tasks or I/O actions prior to command receipt, making it particularly well-suited for programmatic environments, resource-constrained settings, and agent sandboxes. Developers can effortlessly launch it within any project to execute a variety of functions including file reading, code searching, command execution, change implementation, test running, and real-time tool activation streaming. Its underlying architecture is model- and provider-agnostic, allowing for compatibility with local models, API gateways, direct provider connections, and cloud-based inference options. By prioritizing context efficiency, it employs a concise system prompt and a streamlined toolset to reduce token overhead and improve the speed of generating the first response token. Furthermore, this focused approach on lightweight operations and rapid interactions empowers developers to sustain their productivity without the common burdens associated with more intricate environments. In essence, fx represents a significant advancement in efficient coding tools, catering to the needs of modern developers while ensuring a straightforward operational flow.

What is Qwen Code?

Qwen3-Coder is a sophisticated coding model available in multiple sizes, with its standout 480B-parameter Mixture-of-Experts variant (featuring 35B active parameters) capable of handling 256K-token contexts that can be expanded to 1M, showcasing superior performance in Agentic Coding, Browser-Use, and Tool-Use tasks, effectively competing with Claude Sonnet 4. The model undergoes a pre-training phase that utilizes a staggering 7.5 trillion tokens, of which 70% consist of code, alongside synthetic data improved from Qwen2.5-Coder, thereby boosting its coding proficiency and overall functionality. Its post-training phase benefits from extensive execution-driven reinforcement learning across 20,000 parallel environments, allowing it to tackle complex multi-turn software engineering tasks like SWE-Bench Verified without requiring test-time scaling. Furthermore, the open-source Qwen Code CLI, adapted from Gemini Code, enables the implementation of Qwen3-Coder in agentic workflows through customized prompts and function calling protocols, ensuring seamless integration with platforms like Node.js and OpenAI SDKs. This blend of powerful features and versatile accessibility makes Qwen3-Coder an invaluable asset for developers aiming to elevate their coding endeavors and streamline their workflows effectively. As a result, it serves as a pivotal resource in the rapidly evolving landscape of programming tools.

Media

Media

Integrations Supported

Alibaba AI Coding Plan
Claude Fable 5
Claude Mythos 5
Claude Opus 4.1
Claude Opus 4.5
Claude Opus 4.7
Claude Opus 4.8
Claude Opus 5
Claude Sonnet 4
Claude Sonnet 4.5
Claude Sonnet 4.6
Node.js
OpenAI
OpenSpec
Qwen2.5
Qwen3.7-Max
Qwen3.8-2.4T-A95B
Qwen3.8-27B
Qwen3.8-Max
QwenCloud

Integrations Supported

Alibaba AI Coding Plan
Claude Fable 5
Claude Mythos 5
Claude Opus 4.1
Claude Opus 4.5
Claude Opus 4.7
Claude Opus 4.8
Claude Opus 5
Claude Sonnet 4
Claude Sonnet 4.5
Claude Sonnet 4.6
Node.js
OpenAI
OpenSpec
Qwen2.5
Qwen3.7-Max
Qwen3.8-2.4T-A95B
Qwen3.8-27B
Qwen3.8-Max
QwenCloud

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Version
Free Trial Offered?

Pricing Information

Free
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Vercel

Date Founded

2015

Company Location

United States

Company Website

fx.sh/

Company Facts

Organization Name

Qwen

Date Founded

2023

Company Location

China

Company Website

github.com/QwenLM/qwen-code

Categories and Features

Categories and Features

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