Vercel AI Gateway shows open models dominating token volume over closed ones

The AI model landscape just hit a tipping point. Open-weight models now account for 56% of all token volume flowing through Vercel’s AI Gateway as of August 2026, up from a mere 11% in April. That’s a fivefold jump in four months, and it marks the first time open models have overtaken their closed counterparts on this metric. On a single day, August 22, the share spiked to roughly 62%. More recent leaderboard data has shown it touching 78.4%. The volume-revenue paradox Before anyone declares total victory for the open-source crowd, there’s a wrinkle worth examining. Anthropic, maker of the Claude family of closed models, still commands 61-65% of total gateway spend despite representing only about 30% of tokens processed. Its models carry premiums of up to 4.4 times the average token price. That’s the “barbell” pattern emerging across enterprise AI usage. On one end: massive volumes of cheap inference running through open-weight models from labs like DeepSeek, Z.ai, and Moonshot. On the other: premium, high-stakes workloads where companies pay a significant markup for Anthropic’s quality guarantees. DeepSeek has become particularly prominent in this shift, frequently ranking first o...