Mozilla Report: Chinese Open Models Only 4 Months Behind Top US AI at 5x Lower Cost

A Mozilla report finds the gap between closed US frontier models and top Chinese open models has narrowed to about 4.4 months, with open models costing up to 5x less per task. Z.ai's GLM-5.2 trails Claude Opus by less than a point at under a fifth of the price.

• Performance gap is about 4.4 months
• Open models up to 5x cheaper per task
• GLM-5.2 within 1 point of Claude Opus
• 8 of 10 top models on OpenRouter are open, 7 from China