“Best overall combination | ChatGPT Temporary Chat”
“No history: Start a Temporary Chat.”
“No training: Settings → Data Controls → turn off Improve the model for everyone.”
“ChatGPT Business, Enterprise and API data, for example, aren't used for model training by default.”
“Retention: Temporary chats may be retained for up to 30 days for safety purposes.”
“Regular chats remain in history if you only disable training.”
“Best alternative | Claude Incognito”
“No history: Use Incognito Chat.”
“No training: Settings → Privacy → turn off Help improve our AI models.”
“Incognito chats aren't used for model training, even if the training setting is enabled.”
“Retention: Incognito chats are generally retained for 30 days, although enterprise retention policies can differ.”
“Best Google ecosystem option | Gemini Temporary Chat”
“No history: Use Temporary Chat.”
“No training: Turn off Keep Activity under Settings & help → Activity.”
“Retention: Chats may still be retained for 72 hours.”
“Don't submit feedback if you want to avoid having conversation content used for service improvement.”
“Perplexity | Incognito mode | AI data usage opt-out”
“No training: Pro users can opt out of AI data collection in settings.”
“Incognito: Incognito sessions disable saved memories and search history.”
“Important: Don't assume incognito alone is a model-training opt-out; check the separate data-usage setting.”
“Microsoft Copilot | History/personalization controls vary | Yes – Training opt-out”
“No training: Settings → Privacy → disable Training on conversation activity and Training on voice conversations.”
“EU advantage: Microsoft currently states that Copilot conversations from users in the EEA aren't being used for model training.”
“History: You can delete conversations and disable personalization, but that isn't the same as disabling chat-history storage.”