Sam Altman doesn't mince words. In a post on X, he stated plainly: "Codex is the best AI coding product and we want to make it easy to try. For the next 30 days, we are giving companies that want to try switching over two months of free Codex usage." That's a direct, time-boxed offer aimed squarely at engineering teams sitting on the fence between AI coding tools.
The pitch from OpenAI is straightforward: bring Codex to more builders across your company, and for the next 30 days, new Codex users on eligible enterprise accounts can get two months of free Codex usage. The promotion is accessible via the OpenAI Codex Enterprise promo page.
OpenAI is likely betting that hands-on experience will drive long-term lock-in, and this is a direct shot at GitHub Copilot and Cursor, which still charge per seat. With Codex adoption accelerating, the timing is deliberate.
What Is OpenAI Codex?
Codex is an AI agent that helps you write, review, and ship code. It's not a simple autocomplete tool. From routine pull requests to your hardest problems, Codex reliably completes tasks end to end, like building features, complex refactors, migrations, and more. The Codex app is a command center for agentic coding, and with built-in worktrees and cloud environments, agents work in parallel across projects, completing weeks of work in days.
In 2025, Codex moved beyond being just a coding model and became a software engineer teammate, connecting models, local tooling, and cloud to help developers tackle longer, more complex coding tasks.
The agent runs across multiple surfaces: GPT-5.3-Codex is available with paid ChatGPT plans, everywhere you can use Codex: the app, CLI, IDE extension, and web.
Key Technical Highlights
GPT-5.3-Codex sets a new industry high on SWE-Bench Pro and Terminal-Bench, and shows strong performance on OSWorld and GDPval. GPT-5.3-Codex achieves state-of-the-art performance on SWE-Bench Pro, a rigorous evaluation of real-world software engineering. Where SWE-bench Verified only tests Python, SWE-Bench Pro spans four languages and is more contamination-resistant, challenging, diverse, and industry-relevant.
Notably, GPT-5.3-Codex achieves this with fewer tokens than any prior model, letting users build more.
Additional capabilities worth knowing:
- With Skills, Codex goes beyond writing code to directly contribute to the work that turns pull requests into products, like code understanding, prototyping, and documentation, aligned with your team's standards.
- With Automations, Codex works unprompted, picking up routine but important work like issue triage, alert monitoring, CI/CD, and more.
