OpenAI has unveiled a new version of its AI programming model, GPT-5.3 Codex, shortly after the release of Anthropic's flagship neural network, Claude Opus 4.6.
GPT-5.3 Codex is now available in Codex.
— OpenAI (@OpenAI) February 5, 2026
You can just build things.https://t.co/dyBiIQXGx1
The company stated that the LLM transforms the recently launched Codex application from "an agent that can simply write and check code" into an assistant capable of "doing virtually everything that developers and professionals can do on a computer."
OpenAI tested the new neural network across various performance metrics and concluded that it can create "highly functional complex games and applications from scratch in just a few days."
GPT-5.3 Codex is 25% faster than version 5.2. It is the first model from the company that "played a significant role in creating itself." Employees used early modifications of the program for debugging and performance evaluation.
OpenAI and Anthropic launched their new solutions almost simultaneously. Both companies had the same release date and time, but Anthropic later moved its launch 15 minutes earlier.
New Corporate Platform
The releases did not stop there. OpenAI also launched a new corporate platform called Frontier, which "acts as an intelligent layer, integrating disparate systems and data within an organization."
This product aims to simplify the management, deployment, and creation of AI agents that can autonomously perform tasks for companies.
"Frontier is an acknowledgment that we won't create everything ourselves. It's better to work with an ecosystem to create together," commented OpenAI's CEO for applications, Fiji Simo.
Recently, the company has been actively expanding its presence in the business client market. In November 2025, it reported surpassing the milestone of 1 million corporate users.
In January 2026, OpenAI's CFO, Sarah Friar, stated that the B2B sector accounts for approximately 40% of the startup's business.
The new platform complements existing business offerings like ChatGPT Enterprise.
Frontier provides agents with access to a shared context within the client's organization, connecting various internal applications and tools. This enables digital assistants to perform complex tasks and analyze data.
As a reminder, in January, a specialized version of the GPT-5 programming line, GPT-5.2 Codex, became available in Cursor.