reasoning

DeepSeek V4 Pro: 1.6T Open-Weights Model Hits #2 on the Index

DeepSeek V4 Pro is the new #2 open-weights reasoning model and the best agent model in the open-weights field. The catch: it hallucinates 94% of the time on questions it can't answer.

By Sarah Chen · 5 min · Apr 29, 2026