I wonder which model is this based on. I've tried quite some models and so far I've only seen two that are good at keeping continuity: Gemini 2.5 Pro and Sonne

I wonder which model is this based on. I've tried quite some models and so far I've only seen two that are good at keeping continuity: Gemini 2.5 Pro and Sonnet 3.7 (both with reasoning on). These two are also exceptionally good[0] at adding plot twists that aren't in the prompt. [0]: by "my expectation of LLM" standard, not by the standard of bestseller genre fiction.