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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 GPT-4.1?

GPT-4.1 is a cutting-edge AI model from OpenAI, offering major advancements in performance, especially for tasks requiring complex reasoning and large context comprehension. With the ability to process up to 1 million tokens, GPT-4.1 delivers more accurate and reliable results for tasks like software coding, multi-document analysis, and real-time problem-solving. Compared to its predecessors, GPT-4.1 excels in instruction following and coding tasks, offering higher efficiency and improved performance at a reduced cost.

Media

Media

Integrations Supported

.NET
Bind AI
C#
CSS
Clojure
Cursor
EaseMate AI
Elixir
GitHub Copilot
Go
Julia
Kotlin
Python
R
Revise
Ruby
SQL
Shiori
Snowflake Cortex AI
Visual Basic

Integrations Supported

.NET
Bind AI
C#
CSS
Clojure
Cursor
EaseMate AI
Elixir
GitHub Copilot
Go
Julia
Kotlin
Python
R
Revise
Ruby
SQL
Shiori
Snowflake Cortex AI
Visual Basic

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Version
Free Trial Offered?

Pricing Information

$2 per 1M tokens (input)
$2 per 1 million tokens (input)
$0.50 per 1 million tokens (cached input)
$8 per 1 million tokens (output)
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

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com/index/gpt-4-1/

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