The hearings are in stark contrast to previous Chinese political trials in which most defendants have humbly confessed their crimes amid opaque court proceedings.
Revelations of private jet flights, luxury villas and rare animal meats have held Chinese Internet users spellbound, while Bo has showed open disdain for prosecution witnesses, including Gu, whom he derided as "insane".
He confessed to having had extramarital affairs and said Gu moved to Britain because she was angry with him, the court transcripts showed.