A full bench of up to seven judges in Australia's highest court will make the final ruling on whether Gerard Baden-Clay murdered his wife Allison in 2012.

On Thursday morning, the High Court granted the Queensland Director of Public Prosecutions leave to argue Baden-Clay's murder conviction should be reinstated.

Baden-Clay, 45, was convicted of the April 2012 murder of his wife Allison, 43, following a Supreme Court trial in 2014, however, the charge was downgraded to manslaughter on appeal.

The legal team for the one-time Brisbane real estate agent successfully argued in the Queensland Court of Appeal that there was enough evidence to prove Baden-Clay killed his wife but insufficient evidence to prove he did so with intent.