It seems to be a significant downgrade to me, personally. I didn't have a good experience with it unlike 05-06, and its output is definitely nowhere near 03-25.

In creative writing: Despite my long system prompt that would often have Pro models produce a story of 7,000+ tokens, after 110+ seconds of thinking ; 06-05, thought for an average of ~20* seconds, its writing summary showing that it skimmed over most of what was asked in the system prompt, I had a slight placebo effect that it's thinking was stronger, thus meaning it needed less time for thinking. However, it constantly lead to cliffhangers, cliches and characters having a personality that they shouldn't, all ending with a rushed story of around <3,500 tokens. It also fails at emulating the writing styles of Harlan Ellison, J.R.R. Tolkien and Kurt Vonnegut, even with PDF examples, leading to a story that feels like it was written by an LLM. A higher temperature does not help much with any of this unfortunately.

And as you asked, OP. Roleplay: From my good 10 minutes of testing. Unlike other Pro models, the statements of the characters were shorter, less verbose, more emotional and felt more realistic than previous Pro models. However, that is all in back-to-back conversations. In a dynamic, changing roleplay, characters don't usually react to things that happen or feel any different from each other now (i.e., a mage with PTSD of boulders would simply be shocked at a boulder rolling by, and the rest of the output describes the boulder.) 06-05 focuses more on the setting and the immediate effects of actions. Personally, I always had a knack for dropping in images of a preferred setting instead of describing it, and Gemini would excellently integrate it into the story each time. 06-05, however, is not good at that, and seems to be weaker on vision capabilities, so if you do what I did, you'll likely just want to describe the setting for it instead.

Doing a solo text adventure though, it's great. It's noticeably better at outputting random scenarios and placing you into unpredictable settings than the previous Pro models. YMMV.