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GPT-5.3-Codex vs Opus 4.6: The Model That ‘Built Itself’ Meets Autonomous Agent Teams

GPT-5.3-Codex vs Opus 4.6: The Model That 'Built Itself' Meets Autonomous Agent Teams - Featured Image

OpenAI just released GPT-5.3-Codex — the first model the company claims “helped build itself” — and they weren’t subtle about the timing: hours after Anthropic’s Opus 4.6 debut. Both releases landed February 5, each backed by provocative marketing. GPT-5.3-Codex achieved…

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