457转186属于Temporary Residence Transition stream,相关的要求是:
(1)If you apply for the Temporary Residence Transition stream, your skills do not need to be assessed because you have already worked for your nominating employer for two years in Australia.
(2)You must have at least vocational English.
(3)This stream is available only to people who hold a subclass 457 visa. People who hold other 400 series visas may qualify to apply for a permanent residence visa through the Direct Entry stream.
所以看到雅思4个5还是需要的。
457如果不完成2年的工作要求,就不能享受如上的待遇,属于直接申请186的范围。