Grok is playing the best overall chess
Gemini is second best
OpenAI made a lot of mistakes
Claude has been disappointing
DeepSeek is the worst

Recent testing if finding Grok about 1600-1800 and Gemini at 1500-1700.

An 1800 Elo chess rating is generally considered good and above average, indicating a strong club player. It places the player in the top 5% of active players on chess platforms like chess.com. While not a master level, it signifies a solid understanding of chess principles and tactics.