**Chinese AI labs and open-weight models are driving a tight race for top OpenRouter usage share this week, with DeepSeek, Z.ai, and Tencent models posting the highest recent token volumes amid a broader shift toward cost-efficient options.** DeepSeek's V4.1 Flash and related variants lead many daily and weekly leaderboards by raw tokens processed, while Z.ai's GLM 5.3 Flash sits close behind, reflecting strong developer adoption of fast, low-priced Chinese large language models. OpenAI's GPT-5.6 and GPT-6 variants maintain solid but lower aggregate share, and new or stealth entries like Space Bunny Alpha add volatility to the "Other" category. Traders see near-even odds because open-weight models now account for roughly 60% of routed volume, recent releases continue to shift daily rankings, and factors like pricing, context length, and task-specific performance can swing lab totals quickly before the week closes.