NOTES

Findings from the data.

Short, dated observations drawn from what the site already tracks, each with its chart, its data date and what it does not show. Written when the data says something, not on a schedule.

Sep 15, 2026Open weights have trailed the frontier by four to eight months since spring 2025Every time an open-weights model set a new best score since January 2025, the closed frontier had already been there for between 1 and 8 months. Kimi K3 brought the gap to 4.4 months, the low end of the range, not a new regime.

Notes by RSS.