alt Hacker News> “a new knowledge cutoff of August 2025”
This (and the price increase) points to a new pretrained model under-the-hood.
GPT-5.1, in contrast, was allegedly using the same pretraining as GPT-4o.
Replies
FergusArgyll • yesterday at 8:37 PM
A new pretrain would definitely get more than a .1 version bump & would get a whole lot more hype I'd think. They're expensive to do!
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98Windows • yesterday at 8:24 PM
or maybe 5.1 was an older checkpoint and has more quantization
MagicMoonlight • yesterday at 9:07 PM
No, they just feed in another round of slop to the same model.
I think it's more likely to be the old base model checkpoint further trained on additional data.