# Can you tell which AI-generated text is watermarked? > Source: > Published: 2026-08-19 16:37:46+00:00 # Watermark Quiz Both texts below were generated by an LLM with the same prompt. One is watermarked, the other is not. Can you tell them apart? Loading… ## Method Each pair was generated by [Qwen2.5-32B-Instruct](https://huggingface.co/Qwen/Qwen2.5-32B-Instruct) with identical sampling settings. Watermarking is done by [SynthID-Text](https://www.nature.com/articles/s41586-024-08025-4), the method behind both Gemini's and [Claude's watermarks](https://www.anthropic.com/news/claude-text-watermark). Code, key, prompts, and all raw outputs are in [the repo](https://github.com/krishmatta/watermark-quiz).