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 July 31st, 2025 11:59PM ET.
In the case of a tie, all companies tied for 1st place resolve to equal probability, such that they sum to 100%.
See also:
Which company has best AI model end of March? (Chatbot Arena Leaderboard) (resolved)
Which company has best AI model end of April? (Chatbot Arena Leaderboard) (resolved)
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)
Which company has best Search AI model end of 2025? (Search Arena Leaderboard) h