Open-weight models surge to 29% of volume, price per token flattens

Vercel’s July AI Gateway Production Index reports anonymized aggregate routing data collected in June 2026. It says open-weight models handled 29% of gateway tokens on under 4% of spend while frontier labs retained most spending, and leadership varied by modality. The report frames production AI use as a routing problem, with lower-cost models absorbing volume while costly or high-stakes work remains concentrated in frontier systems.