OpenAI is back with a new Codex model, released the same day as Claude Opus 4.6.

The headline pitch is it combines the coding skills of GPT-5.2-Codex with the general knowledge and skills of other models, along with extra speed and improvements in the Codex harness, so that it can now handle your full stack agentic needs.

We also got the Codex app for Mac, which is getting positive reactions, and quickly picked up a million downloads.

CPT-5.3-Codex is only available inside Codex. It is not in the API.

As usual, Anthropic's release was understated, basically a ‘here's Opus 4.6, a 212-page system card and a lot of benchmarks, it's a good model, sir, so have fun.’ Whereas OpenAI gave us a lot less words and a lot less benchmarks, while claiming their model was definitely the best.

OpenAI: GPT-5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT-5.2-Codex with the reasoning and professional knowledge capabilities of GPT-5.2. This enables it to take on long-running tasks that involve research, tool use, and complex execution.

Much like a colleague, you can steer and interact with GPT-5.3-Codex while [...]

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Outline:

(01:50) The Overall Picture

(03:00) Quickly, Theres No Time

(04:15) System Card

(04:49) AI Box Experiment

(05:22) Maybe Cool It With Rm

(07:02) Preparedness Framework

(11:14) Glass Houses

(12:16) OpenAI Appears To Have Violated SB 53 In a Meaningful Way

(14:29) Safeguards They Did Implement

(16:55) Misalignment Risks and Internal Deployment

(18:38) The Official Pitch

(24:28) Inception

(26:12) Turn The Beat Around

(27:35) Codex Does Cool Things

(29:33) Positive Reactions

(38:03) Negative Reactions

(40:43) Codex of Ultimate Vibing

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Narrated by TYPE III AUDIO.

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