Why? There are many, many different Antonov models such as the AN124, AN26, An12, and many more. Antonov is way to general. That's like accepting just "Boeing". You'd get half the list right if you answered boeing. It just doesn't make sense.
The Antonov-225 answer is now dated. I believe that the Stratolaunch has a longer wingspan. In addition, the Spruce Goose of Howard Hughes was as large if not larger than the AN-225, no?