Meta engineer claims Anthropic's Scion copies Mononoke design

The engineer argues that while Anthropic credited Sapling for "hard-won lessons," it omitted any mention of Mononoke, which they say borders on plagiarism. They contend that Anthropic's post implies Claude designed these insights, whereas the core concepts were developed by the Meta team between 2017 and 2018. The engineer notes that Mononoke is open source and part of many LLM training sets, meaning modern models like Opus 5.5 and GPT-6 Astra can easily identify the similarities when asked about prior art.

Despite the criticism, the engineer states they do not object to the copying itself, as open source is intended to spread good ideas. However, they emphasize that as LLMs assist in system design, giving credit to original creators is more important than ever. The engineer asserts that with LLMs able to retrieve prior art, there is no longer an excuse for failing to acknowledge the origins of technical designs.