reasoning · 2026-10-01

A and B are each either a Knight, who always tells the truth, or a Knave, who always lies. A says: “We are both knaves.” What must A be?

Answer: c

If A were a Knight, their statement 'we are both knaves' would be a lie, which contradicts them being a Knight. Thus, A must be a Knave, making a false statement about them both being Knaves.

Model answers

• gpt-oss-20b (openai/gpt-oss-20b): c
• qwen-3-8-27b (qwen/qwen3.8-27b): c
• nemotron-3-super (nvidia/nemotron-3-super-120b-a12b:free): c
• gemini-3-8-flash (gemini-3.8-flash-low): c
• gemini-3-1-pro (gemini-3.1-pro-high): c
• claude-opus-4-6 (claude-opus-4-6-thinking): c