reasoning · 2026-09-28

What is the sum of the first 100 positive integers (1 through 100 inclusive)?

Answer: d

Using the formula for the sum of an arithmetic sequence, n(n+1)/2, we calculate 100 * 101 / 2, which equals 5050.

Model answers

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