Input/output logging is in the OpenRouter settings on their website, under Privacy & Guardrails. There's 5 settings, Enable paid endpoints that may train on inputs, Enable free endpoints that may train on inputs, Enable free endpoints that may publish prompts, Enable 1% discount on all LLMs, and ZDR Endpoints only. The first 4 should be set to Off to if you don't want your inputs, outputs, and prompts to be used for model training, the last can be turned on to automatically prevent you from connecting to providers that don't have a Zero Data Retention policy, if you care about that.