"The company says that the model transforms Codex from an agent that can merely "write and review code" to one that can do "nearly anything developers and professionals do on a computer, expanding who can build software and how work gets done." Having tested its new model against a number of performance benchmarks, OpenAI claims that it can create "highly functional complex games and apps from scratch over the course of days.""
"OpenAI says that GPT-5.3 Codex is also 25 percent faster than its previous model (GPT-5.2) and that it was the company's first model that "was instrumental in creating itself," meaning that the company's staff used early versions of the program to debug itself and evaluate how it was performing. The new model release notably follows hot on the heels of a new agentic coding model released by its competitor, Anthropic."
OpenAI launched Codex, an agentic coding tool, with a new model named GPT-5.3 Codex. The model transforms Codex from an agent that writes and reviews code into one that can perform nearly anything developers and professionals do on a computer, expanding who can build software and how work gets done. GPT-5.3 Codex can produce highly functional complex games and applications from scratch over days. The model is 25 percent faster than GPT-5.2 and aided its own development through early-version debugging and evaluation by company staff. The release followed a competing agentic coding model from Anthropic, which moved its launch up by 15 minutes.
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