OpenAI leads trader consensus for third place in OpenRouter market share for the week of October 19 at 71% implied probability, driven by steady token volume through its GPT-6 Luna and related large language models amid developer routing demand. Recent snapshots show OpenAI hovering near 8% share, trailing DeepSeek’s dominant 30%+ lead from its V4.1 Flash series and Z.ai’s GLM models, while competing closely with Anthropic’s Claude Opus usage and Google’s Gemini variants. Low-cost open-weight offerings from labs like MiniMax and Tencent continue fragmenting volume, but OpenAI’s established ecosystem and recent model updates support its edge in this narrow window. Resolution depends on final weekly aggregates through October 25, with Google at 18% as the nearest alternative.