Meta Unveils TextSeal2 to Improve Detection of AI-Generated Text

Meta unveiled TextSeal2 to improve detection of AI-generated text. The TextSeal2 system uses "copula mixing" to embed a hidden signal in every token. In benchmarks using a Qwen3.5-9B model, TextSeal2 identified 89% of 200-token responses at a 0.1% false-positive rate.