The standout feature is the 1 million token context window, which is made practical by the highly efficient hybrid attention architecture. DeepSeek-V4-Pro uses only 27% of single-token inference FLOPs and 10% of KV cache compared to its predecessor, making long-context tasks genuinely feasible. The open-source MIT license is also a major plus.

I’ve used a lot of AI. This one is easily my favorite. It feels very human, speaks like a friend, and has great humor. It understands what I’m asking even when I explain things poorly or can’t find the right word. It also explains things in super clear ways and goes into great depth. The examples are great, and it never sticks to only surface-level answers. The hypotheticals and concepts stay logical throughout, and it doesn’t feel unrealistic. It also feels 100% ad-free. When it comes to pricing, though, I usually get let down by free-trial limits that you can only get past with a paid subscription. Not only is this one free, but it does better than most others—maybe even all of them. It has even helped me work through stuff related to my emotional disorders, which is usually considered not usable for this kind of thing. Overall, don’t sleep on this one if you’re going to use AI.

Good thinking capabilities. Close to human like.