Comment by Y_Y

Effort (as it's used in the context, how many "thinking" tokens to burn) is still a free variable. It's not always shown to the end user but you can set it independently for any of these models.

After that you just have model "strength" and version number. But of course strength is only comparable at equal version number and the two axes are almost parallel.

Anthropic also does this, perhaps to a lesser extent.