reasoning · 2026-09-18

Three boxes (Red, Blue, Green) hide one prize. Red says 'Prize is in Blue'. Blue says 'Prize is in Green'. Green says 'Prize is in Green'. Exactly one sign is true. Where is the prize?

Answer: a

If the prize were in Green, both Blue and Green signs would be true. If it were in Red, all signs would be false. If it is in Blue, only Red's sign is true, satisfying the condition.

Model answers

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