PrimitiveType.Capsule  

// Creates a capsule primitive
function Start () {
var capsule : GameObject = GameObject.CreatePrimitive(PrimitiveType.Capsule);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Start() {
GameObject capsule = GameObject.CreatePrimitive(PrimitiveType.Capsule);
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Start():
capsule as GameObject = GameObject.CreatePrimitive(PrimitiveType.Capsule)