Provider support status
Anthropic watermark detector
Review Anthropic and Claude watermark support, provenance signals, and current public detection limits.
Run a signal check
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Current support
Anthropic has described Claude text watermarking and upcoming verification access, but public detection is not generally available yet.
What this checks
- Anthropic identifies its text approach as a version of Google DeepMind's SynthID-Text method.
- The watermark does not include user, organization, or chat identifiers.
- The checker can inspect supported files for C2PA provenance metadata even before Claude text watermark verification is connected.
What this does not prove
- Provider announcements do not mean arbitrary pasted text can be verified by third-party tools today.
- Claude watermarking is sparse when the model has few valid wording choices, such as exact facts or code.
- Unsupported outputs should be reported as unknown, not clean.
FAQ
- Can this prove whether content was written by AI?
No. AI Detect reports signals such as provenance metadata, watermark support status, and statistical text risk. It does not claim legal or authorship proof.
- Does text leave my browser during a local check?
Browser-default checks run local text features and provenance checks after you press Check. Server enhanced checks are separate and will be labelled before use.
- Why can a result be unknown?
Many providers do not expose public watermark detectors, and metadata can be absent or stripped. Unknown is a valid result when no reliable public signal exists.
Provider registry
Current watermark support
| Provider | Text watermark | Detection | File provenance | Tamper risk | Updated | Sources |
|---|---|---|---|---|---|---|
| Anthropic / Claudeanthropic, claude, claude-sonnet, claude-opus | plannedSynthID-Text-style statistical watermark | plannedAnthropic has described Claude text watermarking and says a detection API is planned, but no public Claude verification adapter is connected yet. | C2PAsupported_when_present | weak against rewriteClaude text watermarking is described as a statistical wording signal. Substantial rewriting can weaken it; C2PA file credentials are a separate metadata/provenance layer that can be stripped or lost. | 2026-08-17 | |
| Google / Geminigoogle, gemini, synthid | researchSynthID Text | availableSynthID Text is documented for compatible generation pipelines, but it is not a universal detector for arbitrary pasted text. | n/a | weak against rewriteSynthID-class text signals are statistical and should be treated as probabilistic. Media and file provenance can involve separate metadata or pixel-domain marks with different removal risks. | 2026-08-12 |
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