Google's Gemini 4 Argon announcement (September 30, 2026) describes the Vals Index as weighting sectors by contribution to U.S. GDP. Argon led Google's four-model table at 68.9%, ahead of Claude Opus 5.5 (67.0%), Claude Fable 5.1 (65.8%), and GPT-6 Astra (63.1%). Related Vals Finance Agent v2 is a separate multi-step financial research eval.