Watermark status · Updated Aug 2026
Which AI models watermark text?
As of August 2026, only Google Gemini watermarks text in production. Anthropic has announced watermarking for Claude's newest models; no current Claude model is marked yet. ChatGPT and open-weight models do not watermark text.
1/6mark text
1 of 6 major providers watermarks text today
1
Live watermark
Gemini, all models
1
Announced
Claude, models after Aug 2
4
No text watermark
ChatGPT · Copilot · Llama · DeepSeek
Status by provider
| Model | Status | Method | Current models | Detection |
|---|---|---|---|---|
Claude Anthropic | Announced | SynthID-Text Statistical, in word choices | Opus 5, Sonnet 5, Fable 5, Opus 4.8 Not marked (pre-cutoff) | API announced, not shipped |
Gemini Google | Live | SynthID-Text Active since 2024 | All current models | SynthID detection available |
ChatGPT OpenAI | Planned | None deployed Discussed, not shipped | GPT-5, o-series | No text detector |
Copilot Microsoft | None | No text watermarking | — | — |
Llama Meta | None | Open-weight, no mark | Self-hosted | — |
DeepSeek DeepSeek | None | Open-weight, no mark | All models | — |
Per-model index — Claude
Is Opus 5 watermarked?→Is Sonnet 5 watermarked?→Is Fable 5 watermarked?→Is Opus 4.8 watermarked?→Is Haiku 4.5 watermarked?→
No public detector exists yet. Anthropic announced a detection API but has not shipped it, and no third-party tool can read the statistical watermark. Published text stays checkable the day it ships, so cleaning Claude-assisted text now closes the window. Clean your text →