Those resellers are simply just selling Kimi K2.5 or GLM5.1 as counterfeit Opus. We, Chinese, know how to play the counterfeit game for a long time in so many industry.
I just tested the provider that the OP mentioned extensively yesterday, and the models they're selling are definitely not from Anthropic. The voice "sounds" like Sonnet or Opus at first glance, but the intelligence is definitely not there.