Provider status
What can be verified today?
See which providers have a documented text watermark and whether Text Watermark Detector can check it. AI-writing scores are not included.
Tracked providers
Mechanism status shows what the provider offers. TWD integration shows whether we can use it.
OpenAI
OpenAI developed a text watermarking method but is still evaluating it alongside metadata and other provenance options.
announced/experimental
TWD integration: unsupportedResearch text watermarking method
Google
Google applies SynthID Text to Gemini text and offers an early-access detector. Its open-source tools are for teams watermarking their own models.
available
TWD integration: unsupportedSynthID Text
Anthropic
Anthropic says it continues to explore watermarking, but it does not document a deployed text watermark for Claude.
unavailable
TWD integration: unsupported
Meta
Meta's open-source TextSeal toolkit can add and detect text watermarks. Meta does not say that Meta AI or released Llama services use it.
announced/experimental
TWD integration: unsupportedTextSeal research toolkit