DeepSeek's overwhelming 97.8% market-implied odds reflect its sustained dominance in OpenRouter token volume during the week of September 21, driven by cost-efficient large language models such as the V4.1 Flash series that deliver strong price-performance for high-volume developer workloads including agentic tasks and coding. Recent platform snapshots confirm DeepSeek holding roughly 22-26% provider share—well ahead of Z.ai, Tencent, and OpenAI—thanks to open-weight efficiency and aggressive pricing that encourages routing through the marketplace over pricier proprietary alternatives. While this consensus aligns with multi-month trends of Chinese labs gaining routed usage, a sharp late-week spike in competing models or shifts in free-tier availability could still disrupt the outcome before resolution.