**DeepSeek leads the OpenRouter provider market share race for the week of October 5 at an implied 57% probability, but the contest remains tight with Stealth (via the surging anonymous Space Bunny Alpha model), “Other,” and several unnamed labs clustered near 50%.** Recent weekly token-volume data shows DeepSeek holding roughly 23% share amid strong open-weight performance from its V4.1 Flash models, yet a new Stealth entrant has rapidly climbed to near parity by capturing tens of trillions of tokens through aggressive pricing and developer appeal. This dynamic highlights how fast-moving anonymous or open-weight releases can shift aggregated routing demand on the platform, while larger labs like Google, OpenAI, and Anthropic post lower shares in this API-gateway metric that excludes their direct consumer apps. Key swing factors include whether Stealth’s momentum sustains or DeepSeek’s volume stabilizes heading into resolution.