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GPT-5.3-Codex

openai.com

141–150 of 634 posts

Re: GPT-5.3-Codex

#141

I never really used Codex (found it to slow) just 5.2, which I going to be an excellent model for my work. This looks like another step up. This week, I'm all local though, playing with opencode and running qwen3 coder next on my little spark machine. With the way these local models are progressing, I might move all my llm work locally.

I think codex got much faster for smaller tasks in the last few months. Especially if you turn thinking down to medium.

Re: GPT-5.3-Codex

#142
post #30

Anthropic mostly had an advantage in speed. It feels like with a 25% increase in speed with Codex 5.3, they are now losing that advantage as well.

I just asked Opus 4.6 to debug a bug in my current changes and it went for 20 minutes before I interrupted it. Take that as you will.

Re: GPT-5.3-Codex

#143

Earlier quoted context omitted.

Just some anecdata++ here but I found 5.2 to be really good at code review. So I can have something crunched by cheaper models, reviewed async by codex and then re-prompt with the findings from the review. It finds good things, doesn't flag nits (if prompted not to) and the overall flow is worth it for me. Speed loss doesn't impact this flow that much.

Personally, I have Claude do the coding. Then 5.2-high do the reviewing.

Then I pass the review back to Claude Opus to implement it.

Re: GPT-5.3-Codex

#144

I think Anthropic rushed out the release before 10am this morning to avoid having to put in comparisons to GPT-5.3-codex! The new Opus 4.6 scores 65.4 on Terminal-Bench 2.0, up from 64.7 from GPT-5.2-codex. GPT-5.3-codex scores 77.3.

In my personal experience the GPT models have always been significantly better than the Claude models for agentic coding, I’m baffled why people think Claude has the edge on programming.

Re: GPT-5.3-Codex

#145
post #35

Earlier quoted context omitted.

I do not trust the AI benchmarks much, they often do not line up with my experience. That said ... I do think Codex 5.2 was the best coding model for more complex tasks, albeit quite slow. So very much looking forward to trying out 5.3.

Another day, another hn thread of "this model changes everything" followed immediately by a reply stating "actually I have the literal opposite experience and find competitor's model is the best" repeated until it's time to start the next day's thread.

And of course the benchmarks are from the school of "It's better to have a bad metric than no metric", so there really isn't any way to falsify anyone's opinions...

Re: GPT-5.3-Codex

#146
post #35

Earlier quoted context omitted.

I do not trust the AI benchmarks much, they often do not line up with my experience. That said ... I do think Codex 5.2 was the best coding model for more complex tasks, albeit quite slow. So very much looking forward to trying out 5.3.

Another day, another hn thread of "this model changes everything" followed immediately by a reply stating "actually I have the literal opposite experience and find competitor's model is the best" repeated until it's time to start the next day's thread.

Hourly occurrence on /r/codex. Model astrology is about the vibes.

Re: GPT-5.3-Codex

#147
post #93

Earlier quoted context omitted.

I wish they’d just stop pretending to care about safety, other than a few researchers at the top they care about safety only as long as they aren’t losing ground to the competition. Game theory guarantees the AI labs will do what it takes to ensure survival. Only regulation can enforce the limits, self policing won’t work when money is involved.

As long as China continues to blitz forward, regulation is a direct path to losing.

You mean all paths are direct paths to losing.

Re: GPT-5.3-Codex

#148
post #134

I think Anthropic rushed out the release before 10am this morning to avoid having to put in comparisons to GPT-5.3-codex! The new Opus 4.6 scores 65.4 on Terminal-Bench 2.0, up from 64.7 from GPT-5.2-codex. GPT-5.3-codex scores 77.3.

they tested it at xhigh reasoning though, which is probably double the cost of Anthropic's model. Cost to Run Artificial Analysis Intelligence Index: GPT-5.2 Codex (xhigh): $3244 Claude Opus 4.5-reasoning: $1485 (and probably similar values for the newer models?)

With $20 gpt plan you can use xhigh no problem. With $20 Claude plan you reach the 5h limit with a single feature.

Re: GPT-5.3-Codex

#149
post #76

Terminal Bench 2.0 | Name | Score | |---------------------|-------| | OpenAI Codex 5.3 | 77.3 | | Anthropic Opus 4.6 | 65.4 |

yea but i feel like we are over the hill on benchmaxxing, many times a model has beaten anthropic on a specific bench, but the 'feel' is that it is still not as good at coding

When Anthropic beats Benchmarks its somehow earned, when OpenAi games it, its somehow about not feeling good at coding.

Re: GPT-5.3-Codex

#150

I think Anthropic rushed out the release before 10am this morning to avoid having to put in comparisons to GPT-5.3-codex! The new Opus 4.6 scores 65.4 on Terminal-Bench 2.0, up from 64.7 from GPT-5.2-codex. GPT-5.3-codex scores 77.3.

Did you look at the ARC AGI 2? Codex might be overfit for terminal bench
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