Here's why:
* Spelling: The "o" in "cone" is followed by a consonant ("n") and then an "e" at the end. This is a common pattern for short vowel sounds in English.
* Pronunciation: The "o" in "cone" is pronounced as a short "o" sound, similar to the "o" in "hot", "lot", and "stop".
If you want the long "o" sound, you would need a different spelling, such as "tone", "bone", or "phone".