Does anyone know whether SynthID is applied only in Gemini via web/app atm or also Google AI Studio/API? 
Couldn’t find any info on the latter anywhere.
SynthID is only applied to image outputs generated via Gemini when using Google products that explicitly support it, and not via AI Studio or Gemini API; because SynthID uses proprietary embeddings from DeepMind for watermarking and is applied only in controlled environments to ensure the integrity, traceability and model compliance for the watermark.