OpenAI launches its first model partially built by itself: GPT-5.3-Codex

OpenAI launches GPT-5.3-Codex with faster coding, stronger reasoning, and higher benchmark accuracy—plus API access soon.
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OpenAI unveils GPT-5.3-Codex, its first AI model trained by its own AI

OpenAI has introduced GPT-5.3-Codex, a new generation of its Codex coding system that did more than write software for others ...

GPT-5.3-Codex Released as OpenAI’s First AI Model to Assist in Its Own Development

OpenAI’s GPT-5.3-Codex is 25 percent faster and requires less than half the tokens as its predecessor, 5.2-Codex.

OpenAI’s new model leaps ahead in coding capabilities—but raises unprecedented cybersecurity risks

Why OpenAI’s latest coding breakthrough is forcing the company to rethink how—and how fast—it can deploy its most powerful models.