Claude vs ChatGPT Privacy: Which Is Safer With Your Data?

If you care about privacy, should you be using Claude or ChatGPT? It's one of the most common questions from people who use AI assistants for work, research, or anything personal. Both tools are excellent. Both are made by serious US-based companies. And both handle your data differently enough that the answer isn't obvious.

The two platforms have different owners, different defaults, different opt-out controls, and different retention timelines. None of those differences are huge — but they add up. This post compares Claude and ChatGPT directly across training data use, conversation storage, opt-out controls, and data retention, so you can make an informed call rather than guessing based on vibes or marketing.

Who Makes Them and Why It Matters

ChatGPT is made by OpenAI, a US company that started as a nonprofit research lab in 2015 and has since restructured into a capped-profit company. Microsoft is a major investor and OpenAI's primary cloud partner.

Claude is made by Anthropic, a US AI safety company founded in 2021 by former OpenAI researchers — including Dario and Daniela Amodei — who left to focus on AI alignment and safety research.

Both companies are headquartered in the United States and are subject to US law, including any government data requests. Both offer GDPR-compliant options for EU users. Neither sells your conversation data to advertisers (and neither has an ad-supported revenue model that would incentivise them to).

The privacy differences come from defaults, training opt-out controls, and how aggressively each platform uses your conversations to improve their models — not from one company being inherently more trustworthy than the other.

Does ChatGPT Train on Your Conversations?

By default, yes — ChatGPT trains on your conversations if you're on the free tier or ChatGPT Plus. Your messages become part of the data OpenAI uses to improve future models.

You can opt out:

1. Open ChatGPT and go to Settings → Data Controls
2. Turn off Improve the model for everyone

Opting out stops your future conversations from being used for training. It does not delete data that's already been used to train existing models — once data has been incorporated into a trained model, there's no practical way to reverse it.

A few other things to know:

• Turning off chat history also opts you out of training automatically — they're linked
• ChatGPT Team and Enterprise users have training off by default; OpenAI does not use Team or Enterprise conversations for training
• Temporary Chat mode is not saved to your history and is not used for training (OpenAI may briefly retain it for up to 30 days for safety review, then delete)
• Deleted conversations are retained for up to 30 days for safety purposes, then permanently purged

For step-by-step opt-out instructions across all major AI platforms, see how to stop AI training on your data.

Does Claude Train on Your Conversations?

Claude also trains on conversations by default for free and Claude Pro users. The default is the same as ChatGPT — your conversations feed into model improvements unless you turn it off.

To opt out:

1. Open Claude and go to Settings → Privacy
2. Turn off the training data toggle

As with ChatGPT, opting out is forward-looking only. It stops Anthropic from using future conversations to train, but it doesn't reverse training that's already happened on past data.

Other Claude specifics:

• Claude Team and Enterprise plans have training off by default — Anthropic does not use commercial-tier conversations for training
• Anthropic's stated approach leans more towards using data for safety research and alignment than for raw capability improvements — though in practice both feed back into the same model training pipeline
• Claude has no Temporary Chat equivalent. All conversations are saved to your history unless you delete them manually
• Projects offer a way to organise conversations but they're not a privacy feature — Projects content is still subject to the same training settings

If you want to keep a copy of your Claude history outside of Anthropic's servers, see how to export Claude conversations.

Data Retention: How Long Do They Keep Your Data?

Both companies retain conversations while your account is active. The differences are in deletion timelines and how transparently they're published.

ChatGPT:

• Conversations stored indefinitely while your account is active
• Deleted conversations retained for up to 30 days then permanently purged
• Temporary Chats may be retained for up to 30 days for safety review, then deleted
• Account deletion removes your conversations from active systems within 30 days
• Export available: JSON via Settings → Data Controls → Export data

Claude:

• Conversations stored while your account is active
• Deletion timeline less explicitly documented — Anthropic's policy describes deletion but doesn't publish the same specific 30-day window OpenAI does
• Account deletion removes your data within a reasonable timeframe per Anthropic's privacy policy
• Export available: JSON via Settings → Privacy → Export data
• Memory and Projects metadata not fully included in the export

The key distinction: OpenAI publishes more explicit retention timelines than Anthropic. That makes ChatGPT's data handling slightly more transparent on paper. In practice, both companies follow broadly similar processes — they retain data while you're active, retain deleted data briefly for safety, then purge.

For a deeper side-by-side comparison including DeepSeek and Grok, see the AI platform data retention comparison.

Privacy Settings Comparison

Feature	ChatGPT	Claude
Training opt-out	Yes (free + paid)	Yes (free + paid)
Default training	On	On
Team/Enterprise default	Off	Off
Temporary/private chat	Yes (Temporary Chat)	No equivalent
Delete all history	Yes	Yes
Data export	Yes (JSON)	Yes (JSON)
Memory feature	Yes (opt-in)	Yes (Projects + memory)
GDPR compliant	Yes	Yes
Explicit retention timeline	Yes (30 days)	Less explicit
US-based company	Yes	Yes

The headline takeaway: the platforms are more similar than different. The two meaningful gaps are Temporary Chat (ChatGPT only) and explicit retention timelines (more detailed on OpenAI's side).

Which Is More Private?

Honest answer: there is no clear winner. Both platforms train on conversations by default, both offer opt-out, both store data on US servers, both are GDPR compliant, and neither monetises your conversations through advertising.

Where ChatGPT has an edge:

• Temporary Chat gives a genuine session-only mode where conversations aren't saved to your history and aren't used for training
• More explicit published retention timelines — the 30-day deletion window is documented clearly
• Longer track record of published transparency reports and policy documentation

Where Claude has an edge:

• Anthropic's founding mission is AI safety — privacy is more central to their stated values and research priorities
• Slightly less commercial pressure to monetise conversation data compared to OpenAI's deep Microsoft partnership
• Cleaner, simpler privacy settings interface — fewer toggles to get wrong

Neither edge is decisive. If Temporary Chat matters to you (sensitive one-off questions, brainstorming you don't want stored), ChatGPT wins on that specific feature. If you prefer the company whose entire stated reason for existing is AI safety, Claude wins on principle.

Bottom line: whichever you use, the most important thing is configuring it correctly — opt out of training, don't share sensitive data, export regularly, and keep your own local archive.

What to Do Regardless of Which You Use

The platform you pick matters less than how you use it. Five practical steps that apply equally to ChatGPT and Claude:

1. Opt out of training in settings — takes thirty seconds and applies to all future conversations
2. Export your conversations regularly before you delete anything you might want later
3. Use Temporary Chat (ChatGPT) for sensitive one-off questions you don't need saved
4. Delete conversations you no longer need — fewer stored conversations means less exposure if anything goes wrong
5. Store a local archive so you own your history independently of either platform's policies

That last point is the one most people skip. Both ChatGPT and Claude offer JSON exports — AI Chat Importer imports both formats into a single searchable local archive, so you can switch between platforms, delete cloud history, or just keep a backup that no policy change can affect.

Download AI Chat Importer for Windows or Linux — £29 one-time, unlimited storage, fully local. Or try the free web app first to see how it works.

FAQ

Is Claude more private than ChatGPT?

Not meaningfully. Both train on your conversations by default, both offer opt-out, both retain conversations while your account is active. Claude's parent company Anthropic emphasises AI safety more publicly, but the practical privacy controls are broadly the same.

Does Claude train on your conversations?

Yes, by default, for free and Claude Pro users. You can opt out via Settings → Privacy. Claude Team and Enterprise tiers have training off by default and Anthropic does not use those conversations for training.

Does ChatGPT sell your data?

No. OpenAI's privacy policy states they don't sell personal data to third parties. They do use conversation data internally to improve their models (unless you opt out) and share data with sub-processors like Microsoft Azure for hosting, but selling to advertisers is not part of their business model.

Which AI should I use if I care about privacy?

Either, as long as you configure it correctly. Turn off training, don't share genuinely sensitive information, and keep a local backup of your conversations. The privacy gain from picking one over the other is small compared to the gain from using either one carefully.

Can I use both ChatGPT and Claude privately?

Yes. Opt out of training in both, use Temporary Chat in ChatGPT for sensitive questions, and export both platforms' conversations regularly. A local archive tool like AI Chat Importer lets you keep ChatGPT and Claude conversations in one searchable place, so switching between them doesn't fragment your history.

Closing

Claude and ChatGPT are more similar than different when it comes to privacy. Both train on conversations by default. Both offer opt-out. Both store data on US servers and are subject to US law. The real privacy gain doesn't come from picking the "right" platform — it comes from configuring whichever you use correctly, exporting your conversations regularly, and keeping a local copy of your chat history that no future policy change can take away from you.