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I opened your link in a new tab and looked at it a couple minutes later. By then I forgot which was o and which was .5

I honestly couldn't decide which I prefer

I definitely prefer the 4.5, but that might just be because it sounds 'less like ChatGPT', ironically.

It just feels natural to me. The person knows the language but they are not trying to sound smart by using words that might have more impact "based on the words dictionary definition"

GPT 4.5 does feel like it is a step forward in producing natural language, and if they use it to provide reinforcement learning, this might have significant impact in the future smaller models.

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