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Wednesday, September 2, 2026 · UTC
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Anthropic launches AI watermark verification API for regulators and media

Anthropic opens a new API allowing approved entities to verify digital watermarks in Claude AI text output.

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Anthropic launched a watermark verification API on an unspecified date in 2025 to allow approved organizations to verify if text contains a digital watermark from Claude. [1] The EU AI Act requires new Claude models to embed invisible watermarks in their text output as of August 2, 2025. [2] Anthropic announced that its Claude models will soon begin marking text output with invisible watermarks. [3] Google revealed that its visible Gemini watermark on generated images will now be optional. [4] Anthropic claims the watermark may persist through some editing, which they assert should make it far more reliable than traditional detectors like Pangram. [5] Anthropic stated that regulators, law enforcement, media, fact-checkers, independent researchers, educational organizations, and EU civil society groups can request access to the verification system. [6] Google's SynthID distributes an invisible signature across generated images, allowing detection even in cropped versions. [7] OpenAI has a standalone tool to check for SynthID or C2PA in a file, though it reportedly only detects media generated by OpenAI itself. [8]
What this stands on
  1. Anthropic launched a watermark verification API on an unspecified date in 2025 to allow approved organizations to verify if text contains a digital watermark from Claude. · The Decoder
  2. The EU AI Act requires new Claude models to embed invisible watermarks in their text output as of August 2, 2025. · The Decoder
  3. Anthropic announced that its Claude models will soon begin marking text output with invisible watermarks. · lifehacker.com
  4. Google revealed that its visible Gemini watermark on generated images will now be optional. · lifehacker.com
  5. Anthropic claims the watermark may persist through some editing, which they assert should make it far more reliable than traditional detectors like Pangram. · The Decoder
  6. Anthropic stated that regulators, law enforcement, media, fact-checkers, independent researchers, educational organizations, and EU civil society groups can request access to the verification system. · The Decoder
  7. Google's SynthID distributes an invisible signature across generated images, allowing detection even in cropped versions. · lifehacker.com
  8. OpenAI has a standalone tool to check for SynthID or C2PA in a file, though it reportedly only detects media generated by OpenAI itself. · lifehacker.com
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