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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‑5.3‑Codex‑Spark?

GPT-5.3-Codex-Spark is a specialized, ultra-fast coding model designed to enable real-time collaboration within the Codex platform. As a streamlined variant of GPT-5.3-Codex, it prioritizes latency-sensitive workflows where immediate responsiveness is critical. When deployed on Cerebras’ Wafer Scale Engine 3 hardware, Codex-Spark delivers more than 1000 tokens per second, dramatically accelerating interactive development sessions. The model supports a 128k context window, allowing developers to maintain broad project awareness while iterating quickly. It is optimized for making minimal, precise edits and refining logic or interfaces without automatically executing additional steps unless instructed. OpenAI implemented extensive infrastructure upgrades—including persistent WebSocket connections and inference stack rewrites—to reduce time-to-first-token by 50% and cut client-server overhead by up to 80%. On software engineering benchmarks such as SWE-Bench Pro and Terminal-Bench 2.0, Codex-Spark demonstrates strong capability while completing tasks in a fraction of the time required by larger models. During the research preview, usage is governed by separate rate limits and may be queued during peak demand. Codex-Spark is available to ChatGPT Pro users through the Codex app, CLI, and VS Code extension, with API access for select design partners. The model incorporates the same safety and preparedness evaluations as OpenAI’s mainline systems. This release signals a shift toward dual-mode coding systems that combine rapid interactive loops with delegated long-running tasks. By tightening the iteration cycle between idea and execution, GPT-5.3-Codex-Spark expands what developers can build in real time.

Media

Media

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI
OpenAI Codex
OpenClaw

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI
OpenAI Codex
OpenClaw

API Availability

Has API

API Availability

Has API

Pricing Information

Free
Free Version
Free Trial Offered?

Pricing Information

Pricing not provided
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

Categories and Features

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