Gpt‑5-Codex and Upgrades to Codex

2 months ago

3 replies

It's annoying to see a link to a Theo video -- same guy who went with Simon to OpenAI's GPT-5 glazefest and had to backpedal when everyone realized what a shill he is.

I know neither of them are journalists -- I'm probably expecting too much -- but Simon should know better.

Ancapistani

2 months ago

1 reply

While not a journalist, Simon definitely has a background in journalism.

He was one of the original authors of Django, back when it was a “web framework for journalists with deadlines”.

2 months ago

1 reply

Exactly. That's why I said he should know better. He never should have gone to that event to hype GPT-5 under the guise of "testing" it out.

2 months ago

1 reply

I did actually consider that quite a bit when I got invited to OpenAI's mysterious recorded launch event (they didn't tell us it was GPT-5 until we got there) - would it damage my credibility as an independent voice in the AI space?

I decided to risk it. Crucially OpenAI at no point asked for any influence over my content at all, aside from sticking to their embargo (which I've done with other companies before.)

doctoboggan

2 months ago

1 reply

Is it possible that open ai let you test a private version of GPT-5 that was better than what was released to the public, like the previous commenter claimed?

2 months ago

They changed the model ID we were using multiple times in the two weeks we had access to - so clearly they were still iterating on the model during that time.

They weren't deceptive about that - the new model IDs were clearly communicated - but with hindsight it did mean that those early impressions weren't an exact match for what was finally released.

My biggest miss was that I didn't pay attention to the ChatGPT router while I was previewing the models. I think a lot of the early disappointment in GPT-5 was caused by the router sending people to the weaker model.

For what it's worth, the GPT-5 I'm using today feels as impressive to me as the one I had during the preview. It's great at code and great at search, the two things I care most about.

beng-nl

2 months ago

This seems to me like a very harsh take on Theo’s motivations. I don’t know him beyond what I’ve learned from his videos, but given occams razor I’m inclined to believe him: gpt5 seemed much better during the private demo than the public release. There are many possible explanations but jumping to ‘shill’ (implying deception) seems uncalled for.

rolymath

2 months ago

Literally the only channel I've ever blocked on Youtube.

2 months ago

1 reply

Do we really know that gpt-5-codex is a finetune of gpt-5(-thinking)? The article doesn't clearly say that, right?

I suspect that this is smaller than gpt-5 or at least a quantized version. Similar to what I suspect Opus 4.1 is. That would also explain why it's faster.

2 months ago

1 reply

OpenAI say:

"Today, we’re releasing GPT‑5-Codex—a version of GPT‑5 further optimized for agentic coding in Codex."

So yeah, simplifying that to a "fine-tune" is likely incorrect. I just added a correction note about that to my article.

View full discussion on Hacker News

2 months ago

Thank you for your work, Simon.

sanxiyn

2 months ago

> "We find that comments by GPT‑5-Codex are less likely to be incorrect or unimportant" -- less unimportant comments in code is definitely an improvement!

This seems to be a misunderstanding. In the original OpenAI article, comment here is about code review comment, not comment in code.

ID: 45253807Type: storyLast synced: 11/20/2025, 3:29:00 PM

Want the full context?

Jump to the original sources

Read the primary article or dive into the live Hacker News thread when you're ready.

Read Article View on HN

Last activity 2 months agoPosted Sep 15, 2025 at 3:17 PM EDT

Gpt‑5-Codex and Upgrades to Codex

amrrs

57 points

15 comments

Mood

calm

Sentiment

mixed

Discussion Activity

Active discussion

First comment

Peak period

Day 1

Avg / period

7.5

Comment distribution15 data points

Loading chart...

Based on 15 loaded comments

Key moments

01Story posted
Sep 15, 2025 at 3:17 PM EDT
2 months ago
Step 01
02First comment
Sep 15, 2025 at 6:24 PM EDT
3h after posting
Step 02
03Peak activity
12 comments in Day 1
Hottest window of the conversation
Step 03
04Latest activity
Sep 17, 2025 at 4:13 AM EDT
2 months ago
Step 04

Generating AI Summary...

Analyzing up to 500 comments to identify key contributors and discussion patterns

Discussion (15 comments)

Showing 15 comments

lostmsu

2 months ago

1 reply

The pelican is not very good

TiredOfLife

2 months ago

1 reply

But probably fast

AstroBen

2 months ago

Would be faster if it got on the bike

2 months ago

3 replies

It's annoying to see a link to a Theo video -- same guy who went with Simon to OpenAI's GPT-5 glazefest and had to backpedal when everyone realized what a shill he is.

I know neither of them are journalists -- I'm probably expecting too much -- but Simon should know better.

Ancapistani

2 months ago

1 reply

While not a journalist, Simon definitely has a background in journalism.

He was one of the original authors of Django, back when it was a “web framework for journalists with deadlines”.

2 months ago

1 reply

Exactly. That's why I said he should know better. He never should have gone to that event to hype GPT-5 under the guise of "testing" it out.

2 months ago

1 reply

I decided to risk it. Crucially OpenAI at no point asked for any influence over my content at all, aside from sticking to their embargo (which I've done with other companies before.)

doctoboggan

2 months ago

1 reply

Is it possible that open ai let you test a private version of GPT-5 that was better than what was released to the public, like the previous commenter claimed?

2 months ago

They changed the model ID we were using multiple times in the two weeks we had access to - so clearly they were still iterating on the model during that time.

They weren't deceptive about that - the new model IDs were clearly communicated - but with hindsight it did mean that those early impressions weren't an exact match for what was finally released.

For what it's worth, the GPT-5 I'm using today feels as impressive to me as the one I had during the preview. It's great at code and great at search, the two things I care most about.

beng-nl

2 months ago

rolymath

2 months ago

Literally the only channel I've ever blocked on Youtube.

2 months ago

1 reply

Do we really know that gpt-5-codex is a finetune of gpt-5(-thinking)? The article doesn't clearly say that, right?

I suspect that this is smaller than gpt-5 or at least a quantized version. Similar to what I suspect Opus 4.1 is. That would also explain why it's faster.

2 months ago

1 reply

OpenAI say:

"Today, we’re releasing GPT‑5-Codex—a version of GPT‑5 further optimized for agentic coding in Codex."

So yeah, simplifying that to a "fine-tune" is likely incorrect. I just added a correction note about that to my article.