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I looked at the file name but not the document title (specifically because I was wondering if this is 3.1). Good spot.

edit: they just removed the reference to "3.1" from the pdf

I think this is 3.1 (3.0 Pro with the RL improv of 3.0 Flash). But they probably decided to market it as Deep Think because why not charge more for it.

The Deep Think moniker is for parallel compute models though, not long CoT like pro models.

It's possible though that deep think 3 is running 3.1 models under the hood.

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