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Frontier models leave a fingerprint, and it's the lab's, not the model's

pedronasc.com · published 7 July 2026

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https://platform.claude.com/docs/en/about-claude/models/whats-new-claude-4-8
platform.claude.com
https://www.anthropic.com/news/claude-opus-4-8
anthropic.com
https://www.normaltech.ai/p/is-gpt-4-getting-worse-over-time
normaltech.ai
https://arxiv.org/abs/2307.09009
arxiv.org
Sycophancy in GPT-4o: what happened and what we’re doing about it Read at the source ↗
openai.com
https://github.com/pedromnasc/house-style
github.com
https://platform.claude.com/docs/en/about-claude/models/overview
platform.claude.com
Expanding on what we missed with sycophancy Read at the source ↗
openai.com
https://arxiv.org/abs/2506.07962
arxiv.org
https://arxiv.org/abs/2101.05853
arxiv.org