GPT-5.3 Codex Is INSANE! OpenAI’s BEST Model
Might Beat Opus 4.6?

GPT-5.3 Codex is blowing minds in early 2026! In this video, we put OpenAI’s fastest, most interactive coding AI to the test and compare it against Claude Opus 4.6—one of the deepest reasoning, long-horizon planning models out there.