Do you understand that this is a base model? It means you are supposed to take it and post train it. It's much smaller than DeepSeek-v4-Flash, that's already a plus, you compare base to base. 4.1 and 4.1-1017 are trained from the base model.
Different architecture, v4 is text-only while v4.1 is multimodal and so on.
To be a pedant, DeepSeek-V4-Flash-Vision-Exp was a further checkpoint of the V4.0 lineage that supported image input. It lost a few benchmark points compared to the previous 0731 checkpoint so a lot of people skipped it. Completely unrelated to V4.1 though.
I wish labs used more reasonable naming schemes.