While closing the assembly last week Thursday, the speaker, Dr. Adewale Omirin, said the action was taken to enable members go on one-month recess.
But stakeholders in the state, including Governor Ayo Fayose, had criticised the speaker for directing the lawmakers to proceed on recess at a time they said the new government in place would require the Assembly to pass the 2015 appropriation bill as well as screen and confirm political appointees.
Six All Progressives Congress (APC) members of the Assembly had defected to the Peoples Democratic Party (PDP) during the inauguration of Governor Fayose on Thursday.
With the defection, PDP now has seven members while the APC has 19 out of the 26 members of the House.
The speaker had in a statement by his special adviser, media, Wole Olujobi, alleged that there is a plan by the defected APC members to remove him.
Olujobi, who also announced that the assembly would be reopened today, said the complex is being reopened in the public interest.
He said all members of the house have been contacted to resume sitting today.