LLM API Telemetry Catastrophe: What Claude, ChatGPT, Groq Really Log About You

TL;DR Every time you send a prompt to Claude API, ChatGPT API, Groq, or Cerebras, the provider logs it. Prompts retained for 7-30 days. User IP addresses logged indefinitely. Metadata (timestamps, model used, tokens consumed) stored for compliance audits. The OmniGPT breach (Feb 2025) exposed 34 million lines of chat messages + 30K email addresses for $100. Most enterprises don't know their API telemetry is being logged, don't audit what's logged, and don't understand GDPR/CCPA implications. One breach = regulatory liability. What You Need To Know Anthropic Claude API : 30-day prompt retention (7-day default post-Sept 2025). Zero Data Retention (ZDR) available for enterprises but costs extra and isn't default. OpenAI ChatGPT API : 30-day retention on API calls, longer for policy violations. API logs are NOT used for training (as of March 2023), but metadata is retained. Groq : No public data retention policy published. Default behavior: logs all API calls. No guarantee of data deletion