142 AI Model Performance = Converging Rapidly, per Stanford HAI Performance of Top AI Models on LMSYS Chatbot Arena – 1/24-2/25, per Stanford HAI Note: The LMSYS Chatbot Arena is a public website where people compare two AI chatbots by asking them the same question and voting on which answer is better. The results help rank how well different language models perform based on human judgment. Only the highest-scoring model in any given month is shown in this comparison. Source: Nestor Maslej et al., ‘The AI Index 2025 Annual Report,’ AI Index Steering Committee, Stanford HAI (4/25) LMSYS Arena Score AI Model Compute Costs High / Rising + Inference Costs Per Token Falling = Performance Converging + Developer Usage Rising