Days since the previous name

Each bar is a named model. The length is days since the previous announcement. 916 days is the full width. GPT-6.1 Sol is the last bar, at 7.

Not days until retirement. GPT-1 starts the count, so it has no bar. Bar length is the day count divided by 916. Accent is Astra, Sol, and GPT-6.1 Sol. Microsoft’s API stamp moves four earlier gaps by one day. The 19 and the 7 do not move.