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Frontier Models

GPT-5.3-Codex model release and capabilities

Launch of OpenAI's GPT-5.3-Codex model for AI coding with comparative analysis against Claude, focusing on code generation accuracy and instruction following.

7 posts · First seen 2026-02-23 · Last activity 2026-02-23
TimeAuthorPost
2026-02-23T20:50 @GergelyOrosz The first recording from The Pragmatic Summit is available to watch for anyone: How AI is Reshaping the Craft of Building Software. With @thsottiaux (Head of Codex, OpenAI) and @vijayeraji (CTO of Applications, OpenAI) A very good one. Watch it here: https://t.co/apNHGykKbg https://t.co/wNRxSWm2Mp
2026-02-23T20:48 @TheRealAdamG RT @thorstenball: And here is the model that killed it: GPT-5.3-Codex. https://t.co/RfCol0gu3Y https://t.co/3HRMslRJvp
2026-02-23T20:47 @TheRealAdamG RT @cursor_ai: GPT-5.3 Codex is now available in Cursor! It's noticeably faster than 5.2 and is now the preferred model for many of our en…
2026-02-23T18:57 @corbtt Codex the model is great and the app seems quite well done. codex-5.3-xhigh gets essentially all of my coding usage at this point. That said, I still use Opus 4.6 daily in two workflows: 1. Much better browser automation 2. Better at the first draft of planning a major feature https://t.co/4y2rJnbKzn
2026-02-23T18:57 @steipete RT @theguti: Love this flow - pasting a screenshot of instructions to codex - and it just DELIVERS. In this case @openclaw tests started e…
2026-02-23T18:00 @daniel_mac8 GPT-5.3-Codex + the Codex app is the best AI coding tool available right now. Slept on it for a bit. Likely going to move back to a ChatGPT Pro sub from Claude MAX because of how good it is. It's so precise, accurate and excellent at following instructions. There are trade-offs in that it has a more "machine-like" personality than Claude. I do still love Claude. But for getting software dev work done, Codex is the best option right now. It's two things: 1. OpenAI is clearly investing a lot of their human talent into making Codex better. 2. They are co-designing the model and harness together. And I believe that they have the most rapid post-training capabilities which is why you see a new model iteration every month for the last few months. Endorsing Codex.
2026-02-23T17:28 @jxnlco If you’re someone building on the OpenAI platform, using codex, or curious about my experience at OpenAI. Give me a follow as my tweets are going to be a mix of all three. ↩ reply parent
@GergelyOrosz 2026-02-23T20:50
The first recording from The Pragmatic Summit is available to watch for anyone: How AI is Reshaping the Craft of Building Software. With @thsottiaux (Head of Codex, OpenAI) and @vijayeraji (CTO of Applications, OpenAI) A very good one. Watch it here: https://t.co/apNHGykKbg https://t.co/wNRxSWm2Mp
@TheRealAdamG 2026-02-23T20:48
RT @thorstenball: And here is the model that killed it: GPT-5.3-Codex. https://t.co/RfCol0gu3Y https://t.co/3HRMslRJvp
@TheRealAdamG 2026-02-23T20:47
RT @cursor_ai: GPT-5.3 Codex is now available in Cursor! It's noticeably faster than 5.2 and is now the preferred model for many of our en…
@corbtt 2026-02-23T18:57
Codex the model is great and the app seems quite well done. codex-5.3-xhigh gets essentially all of my coding usage at this point. That said, I still use Opus 4.6 daily in two workflows: 1. Much better browser automation 2. Better at the first draft of planning a major feature https://t.co/4y2rJnbKzn
@steipete 2026-02-23T18:57
RT @theguti: Love this flow - pasting a screenshot of instructions to codex - and it just DELIVERS. In this case @openclaw tests started e…
@daniel_mac8 2026-02-23T18:00
GPT-5.3-Codex + the Codex app is the best AI coding tool available right now. Slept on it for a bit. Likely going to move back to a ChatGPT Pro sub from Claude MAX because of how good it is. It's so precise, accurate and excellent at following instructions. There are trade-offs in that it has a more "machine-like" personality than Claude. I do still love Claude. But for getting software dev w...
@jxnlco 2026-02-23T17:28
If you’re someone building on the OpenAI platform, using codex, or curious about my experience at OpenAI. Give me a follow as my tweets are going to be a mix of all three.
↩ reply parent

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