Open-source AI summer wasn't just a vibe.
It was reality ↓
Vercel AI Gateway is showing a clear shift in how developers are using AI models.
June 24, 2026
🟦 Open-weight: 28.4%
🟨 Closed-weight: 71.6%
August 22, 2026
🟦 Open-weight: 62%
🟨 Closed-weight: 38%
In roughly two months, open-weight models went from less than a third of


