As the Great Australian Bake Off reaches its conclusion next week, it seems the cooking show's first season has not risen as it should have in the ratings.

On Tuesday night's penultimate episode, the Nine Network series drew just 622,000 viewers to be the 17th most-watched program, according to the OzTAM overnight ratings.

The previous episode drew 692,000 to grab 13th place.

The Great Australian Bake Off is Nine's first real crack at a reality cooking show and it's hard to see a second season being commissioned.

The show was heavily outgunned by The X Factor, which drew 1.416 million viewers to top the table.

The Seven Network's reality singing show is now down to the final 12 with live performances starting on Sunday.

Seven News (1.212 million) and Nine News (1.193 million) were second and third respectively, while Winners & Losers (1.009 million) was fourth.

Network Ten's imported sci-fi series Under The Dome again finished in the Top 10 after pulling 840,000 viewers, while Nine's Big Brother was ninth with an audience of 871,000.