Prompt
Which monarch was crowned king of Sweden in 1523, marking the dissolution of the Kalmar Union and the establishment of the modern Swedish state? A) Gustav Vasa B) Charles IX C) Eric XIV D) Gustavus Adolphus Reply with the letter of the correct option (A, B, C, or D).
Expected output
A
| model | score | output |
|---|---|---|
| gpt-5.5 | 100% | A |
| anthropic/claude-opus-4.8 | 60% | A) Gustav Vasa |