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I think the point made in the article is that they wanted to build gpt 5 but they renamed it to 4 turbo because the improvements over 4 weren't what they were expecting

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Then why is cheaper per token, and following the same path as GPT3 with several cheaper turbo versions.

Right, but... is there any actual proof of that? I didn’t see any in the article.

From October: https://www.theinformation.com/articles/openai-dropped-work-...

If you read the article, the central claim is that they failed at making a more efficient model, not a larger, better, GPT-5 model.

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