Vercel Says Open-Weight Models Took 71.5% of Tokens, 23% of Spend

Open-weight models process 71.5% of AI Gateway tokens and 23% of spend in September, Vercel reports, with their spend share quadrupling since June. TypeSafe AI's Jev was the fastest-adopted model on record at 35% of paid teams in two weeks, yet took just 0.27% of spend.

• Kimi K3 accounts for nearly half the increase in open-weight spending, Vercel reports.
• DeepSeek-V4.1-Flash handles nearly half of September tokens but takes 2.6% of spend, Vercel reports.
• Spending on open-weight models grows more than seventyfold since December, Vercel reports.