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Did 4.6 not have an x-high reasoning level? Why are they comparing 4.7 x-high with 4.6 high?

It did not. xhigh is new to grok.

Not sure on the API side, in Cursor you can always use 4.6 at xhigh.

We've only used it through API - but you're right, now API supports xhigh for 4.5-4.7.

I think 4.6 got an xhigh after launch. The benchmarks seem to all have been against 4.6 high.