reasoning · 2026-10-02

How many integers between 1 and 20 (inclusive) contain the digit '1' at least once?

Answer: a

The numbers are 1, 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19. Counting them up gives exactly 11 numbers.

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