php, 222 bytes

Result

WA

Duration

494ms

Code [DL]

<?=[$a,$b,$c,$d,$e,$f,$g,$h,$i,$j,$k,$l]=explode(" ",readline()." ".readline()." ".readline()." ".readline()),$g-=$a,$h-=$b,$i-=$c,$j-=$a,$k-=$b,$l-=$c,(($e-$b)*($i*$j-$g*$l)+($f-$c)*($g*$k-$h*$j)+($d-$a)*($h*$l-$i*$k))/6;

stdin

05 16 92
18 26 45
26 83 20
43 67 43

stdout

Array2167-723851-499552

stderr

PHP Notice:  Array to string conversion in /volume/CODE on line 1

strace