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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.

What is GPT-5.1-Codex-Max?

The GPT-5.1-Codex-Max stands as the pinnacle of the GPT-5.1-Codex series, meticulously designed to excel in software development and intricate coding challenges. It builds upon the core GPT-5.1 architecture by prioritizing broader goals such as the complete crafting of projects, extensive code refactoring, and the autonomous handling of bugs and testing workflows. With its innovative adaptive reasoning capabilities, this model can more effectively manage computational resources, tailoring its performance to the complexity of the tasks it encounters, which ultimately improves the quality of the results produced. Additionally, it supports a wide array of tools, including integrated development environments, version control platforms, and CI/CD pipelines, thereby offering remarkable accuracy in code reviews, debugging, and autonomous execution when compared to more general models. Beyond Max, there are lighter alternatives like Codex-Mini that are designed for those seeking cost-effective or scalable solutions. The entire suite of GPT-5.1-Codex models is readily available through developer previews and integrations, such as those provided by GitHub Copilot, making it a flexible option for developers. This extensive variety of choices ensures that users can select a model that aligns perfectly with their unique needs and project specifications, promoting efficiency and innovation in software development. The adaptability and comprehensive features of this suite position it as a crucial asset for modern developers navigating the complexities of coding.

Media

Media

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI Codex

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
OpenAI Codex
C++
Devin Desktop
Elixir
GPT-5.2
GPT-5.4 Pro
GPT-5.4 mini
GPT-5.4 nano
GPT-5.6 Sol
GPT-6 Astra
GitHub
GitHub Copilot
Laravel
Python
Scala
Verdent
Visual Basic

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided

Pricing Information

Pricing not provided
Free Version

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com/index/gpt-5-1-codex-max/

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

Categories and Features

Agentic AI

Not specified

AI Coding Agents

Not specified

AI Coding Models

Not specified

AI Models

Not specified

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