On Saturday, 62% of models used on Vercel's US web development platform were open-weight models from China, a record high and a reversal from June when only 28% were open-weight. The surge was driven by DeepSeek's latest lightweight model, which has become popular due to its low cost. Meanwhile, business demand for Anthropic's cutting-edge Fable 5 has stalled because it is too expensive. On Vercel's AI Gateway, 54% of token volume was accounted for by open-weight models on Tuesday, surpassing the 46% consumed by proprietary models. This shift in usage marks a significant change from June when closed systems dominated with 72% of token volume.
| Signal | Value | Weight |
|---|---|---|
| Correction rate | 0.000 | 0.4 |
| Uncertainty density | 0.142 | 0.25 |
| Assertive mismatch rate | 0.000 | 0.35 |