Step 3.5 Flash, developed by AI company Jiepang Xingchen, has topped the OpenClaw open-source AI assistant framework in daily API calls for three consecutive days, from March 4 to 6. According to data from OpenRouter, the platform recorded 61.3 billion tokens in a single day on March 5. Other leading models include MiniMax M2.5, Arcee AI’s Trinity Large Preview, Moonshot’s Kimi K2.5, and Anthropic’s Claude Sonnet 4.6, with three Chinese models ranking among the top five.