CMMI5 contains a lot of gold. I don't just mean the certificate itself. If an enterprise completely follows the CMMI system to guide the whole process of the project, its role has exceeded its significance.
For a software outsourcing company, especially for foreign users, this certification is still necessary, because although there are relevant system certifications at home and abroad, for foreign users, their recognition of CMMI system is still very high.
As far as I know, there should be no gold content exceeding CMMI5 at present. Another thing to note is that SEI itself is a research institution, and there is no certificate issued to you. The certificate you refer to is only a certificate made by a certified company with relevant qualifications, provided that you have passed the evaluation of your company by the chief appraiser authorized by SEI, and the evaluation result has been affirmed by SEI, and the information has been disclosed on his website.
Finally, to sum up, software outsourcing definitely needs level 3, level 4 and level 5 depending on your own ability, because CMMI is a certification with a heavy workload. If the company is big enough and influential enough, try to do level 5.
Government agencies all over the country are also very beneficial to CMMI. It can be seen that the government's attitude of promoting the implementation of CMMI can improve the company's R&D quality and bring economic benefits. Let's go if you have enough energy! !