The majority of the 100 extra officers will be of constable rank, and the unit will lose Det Ch Supt Duthie, who will become head of homicide next month, and one superintendent.
He stressed that officers will retain their specialisms in terms of the types of crime they investigate.
It comes after a number of failings. Detectives at a unit in Southwark were found to have pressured victims to drop charges to boost performance figures.
Today the current head of the central Sapphire command Detective Chief Superintendent Mick Duthie said officer numbers dealing with sexual exploitation including grooming gangs would be boosted.
An extra 100 police officers are being brought in to tackle exploitation including paedophile rings as part of an overhaul of Scotland Yard's sex crime teams. The force's rape command, Sapphire, is being merged with the child abuse unit as part of a larger overhaul within the Met.
The Metropolitan Police is planning a major shake-up of its rape investigation unit - after a number of serious failings. Sapphire Command put pressure on victims to retract their statements - and failed to investigate cases properly.
They're now merging it with other departments and considering re-naming it.
Lisa Longstaff from Women Against Rape gives her opinion on the Met's new anti-rape strategy to Nina Hossain.
It is being hailed as a radical police strategy to tackle rape. It's being done by the Met's sex crime unit, and it could lead to pubs and clubs being shut down if assaults take place on their premises.
But rape campaigners aren't convinced that it will help women who've lost confidence in the police, because of previous problems at the unit. Here's Ronke Phillips.
The Metropolitan Police has published the following statement on its crackdown on sexual offences:
It is radical, unprecedented and is bound to be controversial - the use of licensing laws to shut down pubs and clubs which have been associated with higher than average levels of rape and sexual assault.
The strategy is the initiatiave of DCI Mick Duthie, the Met's new head of Sapphire, the unit which deals with sex crimes.
He plans to:
• Use the licensing laws for the first time to shut down pubs and clubs which generate a high level of rape and sexual assault.
• Use covert police tactics to target men who have never been charged and convicted of rape, but where intelligence suggests they are perpetrators.
• Initiate a hard-hitting prevention campaign, to target male behaviour and speak to women about reducing their vulnerability.
• Increase supervision of his officers by restructuring Sapphire into five or six large regional teams.
Women's groups have dismissed the initiative as a "diversion". What's needed, according to campaigners, is thorough unbiased investigations and prosecutions so rapists are caught and convicted, and rape is discouraged.