Open models reportedly hit 78.4% of Vercel AI Gateway token volume on September 19

A September 19, 2026 post reports that open models accounted for 78.4% of token volume on Vercel AI Gateway, versus 21.6% for closed models, suggesting it might be a record day for open models' share. The post places Moonshot AI and DeepSeek third and fourth in inference spending; adding Z.ai brought their combined spending above second-place OpenAI. The author stresses that these figures track inference spending across providers, mostly in the US—not revenue going directly to the open-weight labs.