Resolution is based on the chatbot arena LLM leaderboard (https://lmarena.ai), specifically the company with the highest Arena Score in the Overall category without filters (without style control or show deprecated), at the end of June 30, 2025 11:59PM ET.
See also:
Which company has best WebDev AI model end of 2025? (WebDev Arena Leaderboard)
Which company has best Text-to-Image AI model end of 2025? (Artificial Analysis Leaderboard)
Which company has best Text-to-Video AI model end of 2025? (Artificial Analysis Leaderboard)
Which company has best Computer Agent AI model end of 2025? (Computer Agent Arena Leaderboard)
Which company has best Vision AI model end of 2025? (Vision Arena Leaderboard)