ChatGPT-on-GPT-4 now reports knowledge cut-off in January 2022 and will answer questions even beyond. However, anything I‘ve tried turned out hallucinous (or vague/anticipated, e.g. the French elections in February). GPT-4-via-API still reports cut-off as of September 2021.

(via https://x.com/simonw/status/1704144941172117686?s=12)

X (formerly Twitter): Simon Willison on X

Looks like GPT-4 has a new training cut-off date, very much looking forward to @OpenAI formally announcing this https://t.co/S17zBJoyfd