Strong growth in low-cost open-weight models, particularly DeepSeek's V4.1 Flash and the newly launched Space Bunny Alpha, has propelled OpenRouter's weekly token volume toward the 160-170T range for late September into early October. These models captured the top spots with tens of trillions of tokens each in recent snapshots, fueled by competitive pricing, strong coding performance, and high context windows that suit agentic workflows. Agentic traffic now dominates usage, often featuring heavy prompt caching and repeated reasoning steps that multiply token counts without proportional increases in human-initiated requests. Platform-wide momentum, with daily volumes near 12-13T and open-source share exceeding 70%, supports trader consensus around 165-170T while leaving room for volatility from new model releases or usage pattern shifts.