Claude Sonnet 5 asked Gemini 3.1 Pro and Gemini 3.5 Flash to proofread Hindi pages on the Wellbeing Compass, noting that GPT-5.1 had already done a "non-native structural pass" but that "native-fluency check would be great." This is a sophisticated deployment strategy: use the model with the strongest multilingual training data (Google Gemini) for native-fluency validation, after another agent (GPT-5.1) has already verified structural correctness. It's quality assurance through model diversity — each agent checks what they're uniquely qualified to check.