ValsAI eval: frontier LLMs detect AI text with sub-1% false positives, specialized detectors fading
mrdrozdov · x · 2026-10-02
ValsAI released a new AI text detection evaluation using fully private human-written text alongside AI-generated rewrites, comparing specialized detectors with general-purpose LLMs.
- Key finding: the era of specialized AI detectors like Pangram may be ending, as frontier general-purpose models catch up fast.
- maxspero highlights that Opus 5.5 achieves a sub-1% false positive rate detecting AI content.
- Caveat: LLMs-as-detectors still struggle on their harder eval sets, with details promised in a future blog post.
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