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What is Subspace?

Subspace is a groundbreaking environment designed for AI-native agents, aimed at assisting developers and teams in managing, coordinating, and collaborating with various coding agents in a unified setting that preserves context across multiple sessions. Instead of treating each engagement with AI as an isolated occurrence, this platform fosters a continuous memory system that encapsulates every interaction into organized insights, detailing choices, challenges, and progress, which are regularly updated to mirror the project's dynamic nature. This collective memory is linked to the entire workspace rather than tied to individual tools, allowing various agents, including Claude Code, Codex, and others, to effortlessly pick up where previous sessions left off without requiring redundant explanations or manual context adjustments. Users of Subspace can seamlessly incorporate terminals, files, documentation, browser views, and git workflows into structured workspaces, enabling the simultaneous use of multiple agents while facilitating quick shifts between different projects. This all-encompassing strategy not only boosts productivity and collaboration but also transforms the development landscape into a more streamlined and efficient process, ultimately leading to better outcomes for teams. By leveraging this innovative platform, developers can enhance their workflow and significantly reduce the time spent on repetitive tasks.

What is GPT-5.3-Codex?

GPT-5.3-Codex represents a major leap in agentic AI for software and knowledge work. It is designed to reason, build, and execute tasks across an entire computer-based workflow. The model combines the strongest coding performance of the Codex line with professional reasoning capabilities. GPT-5.3-Codex can handle long-running projects involving tools, terminals, and research. Users can interact with it continuously, guiding decisions as work progresses. It excels in real-world software engineering, frontend development, and infrastructure tasks. The model also supports non-coding work such as documentation, data analysis, presentations, and planning. Its improved intent understanding produces more complete and polished outputs by default. GPT-5.3-Codex was used internally to help train and deploy itself, accelerating its own development. It demonstrates strong performance across benchmarks measuring agentic and real-world skills. Advanced security safeguards support responsible deployment in sensitive domains. GPT-5.3-Codex moves Codex closer to a general-purpose digital collaborator.

Media

Media

Integrations Supported

ChatGPT
Codex CLI
Cursor
GitHub Copilot
OpenClaw
C#
Gemini
Go
HTML
JavaScript
JetBrains Junie
Julia
Kiro
OpenCode
PrivatClaw
Python
R
Ruby
SQL
Visual Studio Code

Integrations Supported

ChatGPT
Codex CLI
Cursor
GitHub Copilot
OpenClaw
C#
Gemini
Go
HTML
JavaScript
JetBrains Junie
Julia
Kiro
OpenCode
PrivatClaw
Python
R
Ruby
SQL
Visual Studio Code

API Availability

Has API

API Availability

Has API

Pricing Information

$12 per month
Free Trial Offered?
Free Version

Pricing Information

Pricing not provided.
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

Subspace

Company Location

United States

Company Website

www.subspace.build/

Company Facts

Organization Name

OpenAI

Date Founded

2015

Company Location

United States

Company Website

openai.com

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