What is the smartest AI robot?

Could you elaborate on what criteria you're using to determine the "smartest" AI robot? Is it based on problem-solving abilities, language comprehension, adaptability, or perhaps a combination of these factors? There are many AI robots in existence, each with unique strengths and capabilities, so pinpointing a single "smartest" one can be subjective. Additionally, the field of AI is constantly evolving, with new advancements being made regularly, so the answer to this question may change over time.