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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.io?

Codex functions as a specialized API that delivers advanced data for blockchain and prediction markets, boasting in-depth insights into over 80 million tokens and 700 million wallets across more than 80 networks, including EVM chains and Solana. It ensures real-time price updates, visual graphs, holder data, balance details, and consolidated analytics with refresh rates of less than one second, along with historical USD pricing and support for WebSocket and webhook subscriptions. In addition, Codex compiles insights from various prediction market platforms such as Polymarket and Kalshi, providing a standardized schema that encompasses information on events, markets, traders, holdings, live order books, and trade feeds, while also offering time-specific statistics and ranking signals that include volume, liquidity, open interest, trade counts, and unique trader metrics across diverse intervals from 5 minutes to one week, which are generally inaccessible through venue APIs. Serving as a GraphQL API, Codex can be easily queried by most development teams, and it includes an optional TypeScript SDK for seamless integration. Furthermore, an MCP server is available to guide users through the documentation process. With its free tier accommodating up to 10,000 requests monthly, combined with usage-based Growth pricing and customized Enterprise options, Codex proves to be an indispensable resource for developers aiming to build tailored trading platforms. Through its broad range of features, Codex not only enriches the trading experience but also provides users with the necessary tools to efficiently access and utilize data. This adaptability makes it a preferred choice for those navigating the complexities of blockchain and prediction markets.

Media

Media

No images available

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
Model Context Protocol (MCP)
OpenAI
OpenAI Codex
OpenClaw
Solana
TypeScript

Integrations Supported

Codex CLI
Codex Security
Microsoft Foundry
Model Context Protocol (MCP)
OpenAI
OpenAI Codex
OpenClaw
Solana
TypeScript

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

$350/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

Codex.io

Date Founded

2021

Company Location

Canada

Company Website

www.codex.io

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