In TFA it is put on the list because some of the users of this GPT version were discontent with its cancellation, which caused even OpenAI to oscillate in its decision, so they first cancelled it, then they resurrected it and then they cancelled it permanently, probably because continuing to run it would have cost more than the generated revenue.

Nothing similar happened when the earlier, presumably worse versions were discontinued.

It's Forbes, lads.

Gemini models even in last month add this 4o to any text I can bet that that is added by Gemini :D