DeepSeek's dominant positioning for second place in OpenRouter's weekly token share stems from sustained high-volume usage of its V4 Flash and V4.1 Flash models, which deliver strong price-performance for agentic and high-context workloads amid a broader shift toward cost-efficient Chinese open-weight options. Recent rankings show OpenAI's GPT-5.6 Luna claiming the top spot with roughly 25% share, while DeepSeek holds around 21% through multiple variants, outpacing Z.ai, Tencent, and others. This reflects developer preferences for low-cost inference over premium closed models. A sudden surge from a competitor like Xiaomi or Tencent, or an unexpected drop in DeepSeek routing during the final days of the Sept 7-13 window, could still alter the outcome despite the market-implied odds.