The golden standard is ITU-T P.808 subject test https://github.com/microsoft/P.808 https://github.com/microsoft/P.808 Of course, running a subjective test is ex

The golden standard is ITU-T P.808 subject test https://github.com/microsoft/P.808 https://github.com/microsoft/P.808 Of course, running a subjective test is expensive, and hence, there are objective scores such as DNSMOS and UTMOS which use neural networks to predict P808 values.