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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 CodeX?

CodexPro is an innovative coding assessment platform aimed at hiring professionals and educational institutions alike. Featuring a user-friendly interface, CodexPro streamlines the evaluation process, allowing both assessors and candidates to navigate and assess coding abilities with ease and efficiency. Beyond coding evaluations, CodexPro also includes tests for English proficiency, Data Interpretation, Arithmetic, and Logical Reasoning, which are vital skills in today’s job market. This all-encompassing suite guarantees a comprehensive assessment across various areas, offering a well-rounded perspective on an individual's skills and knowledge. What sets CodexPro apart is its commitment to accuracy; precise evaluations are essential for making informed hiring decisions or monitoring student progress. The platform provides relevant coding challenges, sophisticated analytics, and detailed reports that deliver valuable insights into performance, highlighting strengths and pinpointing areas needing improvement. Whether it's for filling technical positions or assessing academic achievements, CodexPro equips users with powerful features and in-depth analytics to facilitate informed, data-driven choices. Additionally, the platform’s ease of use fosters a seamless experience, encouraging more candidates to engage in the assessment process effectively.

Media

Media

Integrations Supported

Codex CLI
Microsoft Foundry
OpenAI
OpenAI Codex

Integrations Supported

Codex CLI
Microsoft Foundry
OpenAI
OpenAI Codex

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

Free 200 candidates per month
Free Trial Offered?
Free Version

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

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

Company Facts

Organization Name

SmallDay IT Services

Date Founded

2015

Company Location

India

Company Website

codexpro.ai/

Categories and Features

Categories and Features

Pre-employment Testing

Aptitude Testing
Candidate Comparison
Candidate Management
Customizable Tests
Online Testing
Personality Testing
Pre-made Test Library
Real Time Reporting
Skill Testing
Test Authoring
Workflow Management

Technical Screening

Candidate Comparison
Candidate Management
Challenges
Coding Skills Lessons
Customizable Testing
Gamification
Multiple Coding Language Options
Reporting
Test Authoring
Workflow Management

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