- In 2025, five major AI chatbots including Grok, ChatGPT, Claude, Perplexity, and Gemini all leverage user data for AI training, but with different approaches to privacy and control.
- Grok (xAI) uses data from prompts, responses, and even X posts. Users can disable data sharing in Settings or via direct email. A notable feature is Private Chat mode, where data is not used for training and is deleted after 30 days. Businesses have separate API contracts to prevent data usage.
- ChatGPT (OpenAI) by default uses prompts, files, images, and audio to improve its services. Users can easily opt-out through the Privacy Portal. Old data is not removed from training. API and Enterprise businesses have separate privacy terms.
- Claude (Anthropic) is changing its policy from September 2025: it will be opt-in by default, meaning users need to manually disable data sharing if they don’t want their data used for training. Data will be retained for up to 5 years for those who have opted-in. If users do not accept the new terms before September 28, 2025, they will lose access. Enterprise users have separate protections.
- Perplexity by default uses prompt data to improve its AI but does not use email (e.g., Gmail). Users can opt-out via Settings or request account deletion (30 days). Enterprise API has a Data Processing Addendum, offering higher security.
- Gemini (Google) has a complex policy; chat data, files, images, and audio recordings can be used for training and may undergo human review. Users can turn off Gemini Apps Activity or enable temporary mode to prevent training. Data with Activity off is only retained for 72 hours. Workspace (schools, businesses) has separate terms.
- All platforms emphasize that businesses have stricter privacy settings, while individual users need to adjust their settings manually.
📌 In 2025, five major AI chatbots including Grok, ChatGPT, Claude, Perplexity, and Gemini all leverage user data for AI training, but with different approaches to privacy and control. Grok and ChatGPT offer relatively clear opt-out options, while Claude has sparked controversy by switching to an opt-in default from September 2025, with data retained for up to 5 years. Perplexity prioritizes transparency but also collects data by default, while Gemini has a detailed but complex control system. Businesses are generally better protected, while individuals need to proactively disable data sharing. Users should regularly check their settings to avoid unintended data exploitation.
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