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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 Cosyra?

Cosyra provides a cloud development platform focused on mobile use, allowing users to access AI-enhanced coding tools through a full Linux terminal directly on their smartphones. Developers gain access to a range of pre-installed utilities, including Claude Code, Codex CLI, OpenCode, and Gemini CLI, which can be activated simply by entering an API key and starting the terminal. The platform features a standalone Ubuntu environment that comes with essential development tools like Node.js, Python, Git, tmux, and vim, along with 30 GB of persistent storage that keeps data intact across different sessions. Cosyra seeks to replicate the capabilities of a local development environment, allowing users to create, test, and manage their projects entirely from mobile devices. It supports a variety of workflows, such as cloning repositories, reviewing pull requests, running tests, and deploying code, all while ensuring that sessions remain persistent and can be paused and resumed seamlessly. By enhancing productivity on mobile devices, Cosyra enables developers to work more flexibly and efficiently, transcending the constraints usually inherent in standard coding environments. This innovative approach ensures that coding can be as accessible and effective on the go as it is at a traditional workstation.

Media

Media

Integrations Supported

Codex CLI
OpenAI Codex
Claude Code
Codex Security
Gemini CLI
Git
Microsoft Foundry
Node.js
OpenAI
OpenClaw
OpenCode
Python
Vim
tmux

Integrations Supported

Codex CLI
OpenAI Codex
Claude Code
Codex Security
Gemini CLI
Git
Microsoft Foundry
Node.js
OpenAI
OpenClaw
OpenCode
Python
Vim
tmux

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided.
Free Trial Offered?
Free Version

Pricing Information

$29.99 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

Cosyra

Date Founded

2025

Company Location

United States

Company Website

cosyra.com

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