OpenAI Introduces Watermarking in its API – Disabled by Default
OpenAI is launching support for text watermarking within its developer interface. The feature is disabled by default to provide developers with full control over their applications.

What happened?
OpenAI has launched support for text watermarking via its API. The feature allows developers to include an invisible digital signature in text generated by the company's AI models, facilitating the identification of AI-generated content. Unlike competitor Anthropic, OpenAI has opted to have the feature disabled by default.
Key facts
| Status för vattenmärkning | Avstängd som standard (off by default) |
|---|---|
| Konkurrentjämförelse | Anthropic har funktionen aktiverad som standard |
Why it matters
The traceability of AI-generated text has become a key issue in combating disinformation and preventing misuse. By offering watermarking at the API level, OpenAI provides organisations with better tools to monitor and control their content while maintaining flexibility for developers who do not wish to impact the model's latency or generation patterns.
Who is affected?
The update primarily concerns software developers and companies building applications on top of the OpenAI API. Developers must now actively choose whether they want generated text to include watermarking data.
Impact on the EU
The feature is being made available globally via OpenAI's API, meaning developers and companies in the EU also gain access to the tool. Unlike certain stricter consumer regulations, the optional default setting does not directly impact existing systems used by EU developers.
What else you should know
Previously, Anthropic implemented watermarking in its developer tools but opted to have the feature enabled by default. OpenAI's decision to make the function optional means it is up to each individual developer to evaluate the need for traceability versus any potential impact on model performance.
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