Anthropic blocks users for anything touching training larger models
What happened
A user reported that Anthropic blocked their account after they were flagged for “training a competitor,” preventing any work involving reinforcement fine‑tuning (RFT), supervised fine‑tuning (SFT), or training larger models, and even downgraded their access from Opus 5.5 to Opus 5 or terminated sessions. The user criticized Anthropic for restricting research automation despite building its models on publicly available data.
Why it matters
The incident highlights Anthropic’s restrictive policies on using its models for further training or large‑scale automation, raising concerns about access for researchers and potential double standards in how the company treats its own data versus user‑generated work.
Is this a big deal?
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