The Open Weight Models that Matter: June 2026

A slew of compelling open-weight models have been released in the past few months, including from new players in both China and the US. Additionally, open-weight models are having a moment in the sun as cost becomes a central focus of organizations with scaled AI usage. Contrary to the expectations of many, the intelligence and capability of open-weight models are keeping up with US frontier labs, and have been maintaining a consistent 3-6 month gap for over 18 months. The frontier labs do not (at this moment, anyway) appear to be accelerating away from open-weight labs. There are tremendous cost-savings opportunities moving workloads from frontier models, to open weight. Inevitably the frontier will move on, but costs will continue to drop for any fixed point of intelligence. Between the pace of releases, the jagged frontier of capabilities, and new entrants, it’s very hard to know what models you might want to look at, and why. As of June 2026, we believe these are the four open-weight models that matter the most. 1. DeepSeek V4 Flash — The first to…