I have been testing out some system prompts for my AI studio Gemini pro 2.5, and so far, it was quite good, holding clarity and nice narrative for a while.

I am a casual user of Fantasy driven bots and I enjoy long slow burn stories, and the 1m context window of pro 2.5 was a lifesaver.

Until it started to have ceberal palsy and degraded into repeating words and writing over 9 adjectives to every sentence. I have zero idea when, but it started around the 370k mark. And even editing and adding negative keywords it just doesn't stop.