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Why? This just follows the scheme they have established in 5.6, just that GPT 6 introduced Astra as another tier above Sol.

How will GPT-5.6 Sol and GPT-6 Sol be differentiated?

...by the version number? How are Claude Opus 4.8 and Claude Opus 5 differentiated?

What do you mean? Are you confused by the iPhone 18 being better than the iPhone 17? Better specs

>How will GPT-5.6 Sol and GPT-6 Sol be differentiated?

You literally just differentiated them in this sentence?