New series in December and the catch?

[vzyro00]

To anyone who tested the beta for series 5.1, can anyone tell me their findings? The differences between 4.1 vs 5.1. and the changes?

[vb]

Good point!
We don’t yet know whether this will be a successor to the 4.1 series or an upgraded version of GPT-5.

Beyond that, everything is still rumor for now — there’s no official confirmation, just some text buried deep on a CDN-hosted webpage.

[polepole]

On API documentation there is no update, but in ChatGPT system prompt there is some updates.

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