It seems to be an A/B testing experiment:
https://www.reddit.com/r/ClaudeCode/comments/1xr9x5y/the_ner...
This account claims Sonnet and Opus 5.6 are in A/B testing now. There is nerfing when they release a new version, for reallocating resources.
IPO is coming so they will have to maximize profits going forward which will mean constraining the compute they give everyone to ensure the subscriptions make money.
And here I thought it was them taking away datacenter usage so they could drop a new model soon.
Do they ever test by giving the model more resources to see if they can give users more for the same price ? Just saying
You know what will never ab test your usage? Local ai. Just saying.
The way Anthropic continues to get away with testing these nerfing "experiments" on customers without their consent depriving them of the model quality they've paid for is wrong.
The Windows Insider program has shown plenty of people will willingly sign up to be testers for a taste of the rawhide. Anthropic could do this in a transparent way but they continue to choose not too.