Google's unpaid Gemini API terms let human reviewers read inputs and outputs, and tell developers not to submit personal data.
Anthropic and OpenAI do not train on API data by default. OpenAI keeps abuse-monitoring logs up to 30 days.
For clients in the EEA, Switzerland or the UK, Google's terms say paid-service data rules apply to all services, including free ones. Read the clause and confirm with counsel.