OpenAI Announces GPT-5.3-Codex

Is GPT-5.3-Codex a revolutionary leap in AI capabilities or an impractical tool with usability flaws?

Published 10 hours ago

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Above: The OpenAI logo displayed on a smartphone. Image credit: Samuel Boivin/NurPhoto/Getty Images

The Spin

Narrative A

The launch of GPT-5.3-Codex represents a monumental leap in AI capabilities, with the model achieving unprecedented performance across every major benchmark, all while operating at faster speeds and using fewer tokens. In application, the codex holds the promise to revolutionize the working environment, with the tool capable of performing complex tasks across multiple domains for maximum efficiency.

Openai

Sam Altman on X

Narrative B

While GPT-5.3-Codex is a substantial upgrade, OpenAI has made numerous adjustments that limit its functional capabilities. The codex's slow running time, for example, makes the model impractical for many real-world workflows, where developers need rapid iteration cycles. At the same time, its status updates can be unreliable and its run summaries too technical, which could alienate less experienced developers.

Matt Shumer