New on the blog: Anthropic Just Watermarked Claude. It Cannot Tell You Who Wrote the Essay.

Anthropic began marking Claude output on August 2, worldwide. Before anyone tells your department the detection problem is solved, read the sentence the company actually wrote: detecting a Claude mark tells you the content may have been processed by Claude.

May. Processed. Not wrote.

The piece walks the three things the mark cannot tell you, why the incentive it creates rewards the student who launders the output through a second tool, and the three checkpoints to ask for instead.

https://www.harvestkernel.com/claude-watermark-authorship-not-detection/