Open-weight models anyone can download and run trail the closed frontier by months, not years.
Each point is a new best open model, placed when its weights were published. Its height is how long before that a closed model had already reached the same score; zero means no closed model had that score yet. Points before the first measured closed model are left out. Hover for both models.
Weights out is when the weights were published, which can trail the announcement. Cheapest price is the lowest API provider on OpenRouter, blended 3:1 input to output.