Google's October 13 global release of Gemini 4 Argon, following a limited September rollout, has driven trader consensus toward its 70% implied probability as the leading model by October 26. The frontier large language model leads or ties on key benchmarks including the Vals Index for economic impact tasks, DeepSWE v1.1 for agentic software engineering at 77.9%, and long-context GraphWalks evaluations, with demonstrated gains in multi-step coding, finance, legal, and cybersecurity workflows. Earlier September launches of Anthropic's Claude Fable 5.1 and Opus 5.5 maintain competitive showings on select independent indices but trail in recent domain-specific results and lack comparable late-October momentum. With resolution days away, traders appear to weigh Argon's fresh availability and benchmark edge as decisive.