MA
We need to talk about this...Matthew Berman10 Sept 2026
Announced Feb 5, 2026 as OpenAI's first model instrumental in creating itself; the Codex team used early versions to debug training, manage deployment and diagnose evaluations.
GPT-5.3 Codex at a glance
- What is GPT-5.3 Codex?
- GPT-5.3 Codex is a model from OpenAI. OpenAI's agentic coding model powering Codex in the CLI, IDE extension, desktop app and ChatGPT cloud.
- Who makes GPT-5.3 Codex?
- GPT-5.3 Codex is made by OpenAI.
- Does GPT-5.3 Codex work in the EU?
- Available in the EU. OpenAI publishes Europe Terms of Use for EEA residents (contracting entity OpenAI Ireland Ltd), offers a DPA and GDPR compliance, and provides data residency for ChatGPT and API business products. No EU-specific restriction on Codex was found in the provided material. Last verified 14 Nov 2026.
- How much does GPT-5.3 Codex cost?
- Freemium. Codex is included in ChatGPT plans (Plus, Pro, Business, Edu, Enterprise) with usage limits that rise by plan; API-key use is also possible. Specific prices are not given in the provided material. Licence: Proprietary model; Codex CLI is Apache-2.0.
- Where was GPT-5.3 Codex shown?
- In 1 creator video by Matthew Berman. Most recently by Matthew Berman on 10 Sept 2026, at 6:43 in “We need to talk about this...”.
Sources: the vendor's own pages (linked above) and creator videos at the linked timestamps. EU status is information, not legal advice; see how we check.
About
GPT-5.3 Codex is an OpenAI model for agentic software engineering, used through the Codex product family. It was announced on 5 February 2026. According to creator coverage of the announcement, OpenAI said early versions were used by the Codex team to debug training, manage deployment and diagnose evaluations.
Codex handles tasks such as bug hunting, refactors, feature work, pull-request review and releases. It can run multiple agents in parallel, use computer and browser tools to verify work, and continue tasks in cloud environments set up per repository. Plugins connect it to other tools and apps.
It is available in ChatGPT (Codex web at chatgpt.com/codex), the Codex cloud, an IDE extension (VS Code, Cursor, Windsurf), a desktop app and the open-source Codex CLI. Access is included in ChatGPT Plus, Pro, Business, Edu and Enterprise plans, or via an API key with extra setup. The model weights are not published; only the CLI client is open source under Apache-2.0.
Key features
- Agentic coding: bug fixing, refactors, features, reviews and releases
- Parallel multi-agent workflows with computer and browser tool use
- Cloud environments that keep running tasks after the laptop is closed
- Automated pull-request code review
- Available in ChatGPT, IDE extension, desktop app and terminal CLI
- Plugins to connect external tools and apps
1 moment
As seen on YouTube
Watch the moment: the exact second top creators show it. Videos load only when you press play, via youtube-nocookie.com.
Keep exploring
Similar AI tools
Closest neighbours by meaning, not just by category.
CO
Codex
App · OpenAI
OpenAI's coding agent, available in the ChatGPT app, cloud, IDE extension and CLI under one ChatGPT account.
Available in EUCoding
Release date n/aFreemium
CI
Codex in the cloud
App · OpenAI
OpenAI's cloud-based coding agent that runs engineering tasks in remote environments, accessed via ChatGPT.
Available in EUCoding
Release date n/aFreemium
CC
Codex CLI (refreshed)
App · OpenAI
OpenAI's open-source coding agent that runs in the terminal, with voice control and a new code review experience.
Available in EUCoding
13 Apr 2025Open source
CI
Codex in ChatGPT mobile app
App · OpenAI
Mobile access to Codex in the ChatGPT iOS and Android app to monitor, approve and start coding tasks running on your machines.
Available in EUCoding
14 May 2026Freemium
CW
Codex Windows Computer Use & Remote Control
App · OpenAI
Codex app update adding computer use on Windows and remote control of Windows devices from the ChatGPT mobile app.
Available in EUCoding
Release date n/aOpen source
OC
OpenAI Codex updates (28-day shipping challenge)
App · OpenAI
OpenAI's Codex coding agent and its 28-day series of daily product updates, including desktop app and caching changes.
Available in EUCoding
Release date n/a