Claude vs ChatGPT - GDPR & Data Privacy Comparison for European Clients
Version: June 2026 - prepared by WAIMAKERS B.V.
1 Purpose
This report compares how Claude (Anthropic) and ChatGPT (OpenAI) handle personal data in relation to the General Data Protection Regulation (GDPR), with a focus on European customers. Both are general-purpose assistants with consumer, business, enterprise, and API routes, but they differ most on one point that matters for EU procurement: EU data residency.
2 At-a-glance comparison (business / enterprise routes)
| Dimension | ChatGPT (OpenAI) | Claude (Anthropic) |
|---|---|---|
| No training on your data | ✅ ChatGPT Business, Enterprise, Edu, and API are not used for training by default | ✅ Team (Standard & Premium), Enterprise, and API - no model training on Customer Content under Commercial Terms |
| EU data residency | ✅ Native: ChatGPT Enterprise/Edu offer regional at-rest + inference residency for Europe; eligible API projects/endpoints support EU residency | ⚠️ Not first-party: Team/Enterprise via claude.ai store data in the US. EU residency only via AWS Bedrock EU profiles or Google Vertex AI EU regional endpoints |
| Consumer-tier training default | Free/Plus trained on by default; opt out via Data Controls | Free/Pro/Max opt-in by default since Oct 8, 2025; up to 5-year retention unless opted out |
| Retention (business/API) | ~30 days for abuse monitoring; ZDR/MAM for approved eligible use cases | 30 days default for API inputs/outputs; ZDR by agreement; Enterprise custom retention |
| Certifications | SOC 2, enterprise compliance programme | ISO 27001:2022, ISO 42001 (AI management), SOC 2 Type I & II |
| EEA contracting / DPA | OpenAI Ireland Ltd. is the contracting entity for EEA/CH; DPA with SCCs (updated Jan 1, 2026) | Anthropic Commercial Terms with DPA + SCCs automatically incorporated |
| Regulatory note | Italy's Garante fined OpenAI €15M (Dec 2024); the Court of Rome annulled the fine (March 2026). Irish DPC is lead supervisory authority | No equivalent headline EU enforcement action to date |
Bottom line: Both vendors give you a genuine no-training commitment on their business and enterprise tiers. The decisive difference is how you get EU data residency: ChatGPT can keep eligible Enterprise/Edu and API data in Europe natively, while Claude requires you to deploy through a cloud provider's EU region (Bedrock or Vertex) to achieve the same.
Capability & feature comparison
Beyond compliance, here is how the two assistants compare on everyday capabilities (consumer/business apps, mid-2026 - features evolve quickly).
| Capability | What it is | Claude (Anthropic) | ChatGPT (OpenAI) |
|---|---|---|---|
| Reasoning models | Slower "thinking" mode for hard problems | ✅ Opus 4.8 / Sonnet 4.6 (fast thinking) | ✅ GPT-5.5 Thinking / Pro - our pick for complex reasoning |
| Web search | Live web answers with citations | ✅ All plans | ✅ All plans |
| Deep research | Agent browses many sources → cited report | ✅ Research (Pro and up) | ✅ Deep Research |
| Custom assistants | Pre-configured, reusable assistants | ⚠️ Projects (no public marketplace) | ✅ Custom GPTs + GPT Store |
| AI agents / tool calling | Acts autonomously and picks which tool/skill to use | ✅ Leads on tool calling - chooses the skill/tool itself (Claude in Chrome, Agent SDK) | ✅ ChatGPT agent - you invoke Custom GPTs manually |
| Skills | Packaged instructions + scripts loaded on demand | ✅ All plans (open standard) | ⚠️ Beta (business tiers) |
| Connectors & plugins (MCP) | Connect to your apps and data | ✅ MCP (created by Anthropic), Connectors | ✅ Apps & Connectors, GPT Actions, MCP |
| Office files (Excel / PowerPoint / Word) | Build & edit real Office documents | ✅ Strong - in-app plugins + code execution | ⚠️ Weaker at Office formatting |
| Code & data analysis | Runs code on your files, builds charts/files | ✅ Code execution + file creation (xlsx/pptx/pdf) | ✅ Advanced Data Analysis |
| Image generation | Create images from a prompt | ❌ Analyzes images only (no native generation) | ✅ Native image model |
| Voice mode | Spoken back-and-forth conversation | ⚠️ Mobile app (beta) | ✅ Advanced Voice |
| Memory | Remembers context across chats | ✅ All plans | ✅ All plans |
| Files & vision | Upload and analyze documents and images | ✅ All plans | ✅ All plans |
| Workspace / canvas | Side panel to draft docs, code, and apps | ✅ Artifacts (+ shareable interactive apps) | ✅ Canvas |
| Context window | How much it can read at once | 200K–1M tokens (model-dependent) | Up to ~1M tokens (model-dependent) |
| Apps & platforms | Where you can use it | Web, desktop, mobile, Claude Code (CLI/IDE) | Web, desktop, mobile, Codex |
A ✅ marks that a capability is available - not how capable or mature it is. Where each tool genuinely excels is summarised below.
What each is best at
- Claude (Anthropic) - the execution leader. It builds and edits real work: Excel models, PowerPoint decks and Word documents through its in-app plugins and code execution, and handles long documents in full context. Its real edge is tool calling: where in ChatGPT you pick the right Custom GPT yourself, Claude works out on its own which skill or tool to call for the task - an AI deciding which AI to use, which is what makes it a genuine agent. Anthropic also pioneered the open standards the rest of the industry is now adopting - MCP for connectors and Skills for reusable, packaged expertise.
- ChatGPT (OpenAI) - the reasoning and breadth leader. Strongest for reasoning through complex documents and high-stakes analysis, plus the widest toolkit: Custom GPTs (a more mature store than Claude's Projects), native image generation, and voice.
Our take: it's an AND, not an OR. In our hands-on use the split is consistent: reach for Claude to build and execute - Excel, PowerPoint and Word, file-heavy work, and agents that call their own tools; reach for ChatGPT to reason - thinking through complex documents and analysis - and for Custom GPTs, image and voice. The strongest teams run both (often Gemini too) and let them check each other.
Claude is much better at Excel and PowerPoint, while ChatGPT is much better at reasoning - it's an AND, not an OR.
- Wouter van Haaften, WAIMAKERS
3 ChatGPT (OpenAI) - tier comparison
| Plan | GDPR-compliant? | EU data residency | Training on your data | Retention | Guide price* |
|---|---|---|---|---|---|
| Free / Plus | ⚠️ Limited for business | ❌ No | Trained by default; opt out via Data Controls | History persists unless deleted | Plus €23/mo (incl. NL VAT) |
| ChatGPT Business (renamed from Team, Aug 29, 2025) | ✅ Yes | ❌ No (no EU-only option yet) | ❌ Not trained by default | Deleted/unsaved chats removed ≤30 days | $25/seat/mo monthly or $20 annual (excl. VAT) |
| ChatGPT Enterprise / Edu | ✅ Yes | ✅ Yes (regional at-rest + inference residency where supported) | ❌ Not trained by default | Admin-configurable; deleted chats ≤30 days | Custom (EUR) |
| OpenAI API (Business/Edu) | ✅ Yes | ✅ Yes (eligible projects/endpoints) | ❌ Not trained by default | Up to 30 days for abuse monitoring; ZDR/MAM for approved use cases | Usage-based |
- EEA/CH contracting entity: OpenAI Ireland Ltd. Data residency for ChatGPT currently applies to eligible Enterprise/Edu workspaces (not Business); inference residency is available for Europe and the US. External integrations, web search, and some metadata remain outside the residency guarantee.
4 Claude (Anthropic) - tier comparison
| Tier | GDPR posture | EU data residency | Training on your data | Retention | Guide price* |
|---|---|---|---|---|---|
| Free / Pro / Max | ⚠️ Consumer terms | ❌ No (global) | Opt-in by default since Oct 8, 2025; Incognito available | Training on: up to 5 years; training off / Incognito: 30 days | Pro ~€18 + VAT |
| Team Standard / Premium | ✅ Commercial terms | ❌ No first-party (US storage; EU only via Bedrock/Vertex) | ❌ No training on Customer Content | Org controls; API-like defaults | $25 / $125 per user/mo |
| Enterprise | ✅ Commercial terms | ❌ No first-party (US storage); EU only via Bedrock/Vertex | ❌ No training on Customer Content | Custom org-level retention | Custom |
| Anthropic API | ✅ Commercial terms | ✅ Via AWS Bedrock / Google Vertex AI EU regions (direct API: US/global only) | ❌ No training on Customer Content | 30 days default; ZDR by agreement | Usage-based |
- The EU-residency path: The direct Anthropic API offers only
"us"and"global"inference geographies - there is no dedicated EU-only option. For EU residency, route Claude through AWS Bedrock EU inference profiles or Google Cloud Vertex AI EU regional endpoints, where the cloud provider's DPA applies. Consumer tiers (Free/Pro/Max) should not be used for EU personal data; verify your training opt-out atclaude.ai/settings/data-privacy-controls.
5 Key differences
- EU data residency is the headline. ChatGPT offers native EU residency on eligible Enterprise/Edu workspaces and API projects. Claude's first-party plans store data in the US; genuine EU residency requires deploying via AWS Bedrock or Google Vertex AI EU regions.
- No-training commitments are comparable on business/enterprise tiers: ChatGPT (Business/Enterprise/Edu/API) and Claude (Team/Enterprise/API under Commercial Terms) both exclude your data from foundation-model training by default.
- Consumer-tier defaults differ in direction: ChatGPT consumer plans train by default and you opt out; Claude consumer plans, since Oct 8, 2025, default to opt-in for training with up to 5-year retention. In both cases, do not process EU personal data on consumer tiers.
- Certifications: Anthropic holds ISO 42001 (AI management system) in addition to ISO 27001 and SOC 2; OpenAI maintains SOC 2 and an enterprise compliance programme.
- Regulatory history: OpenAI faced (and ultimately overturned) the Italian Garante's €15M fine; the Irish DPC is its lead supervisory authority. Claude has no equivalent headline EU enforcement action to date.
6 Recommendations (GDPR-first)
- If you need EU data residency with the least integration effort: ChatGPT Enterprise/Edu (or an eligible OpenAI API configuration) keeps covered data in Europe natively.
- If you prefer Claude (e.g. for reasoning, long context, or Claude Code): deploy through AWS Bedrock EU profiles or Google Vertex AI EU regional endpoints to obtain EU residency, and enable Zero Data Retention where required.
- For either vendor: sign the DPA, complete a DPIA for personal or special-category data, configure retention, and use SSO/admin controls on enterprise tiers.
- Never process EU personal data on consumer tiers of either tool; on Claude, verify the consumer training opt-out explicitly.
7 Decision guide
- Microsoft-centric organisation already standardising on Office: ChatGPT (or Copilot) usually integrates with the least friction; ChatGPT gives native EU residency on Enterprise/Edu.
- You want the strongest no-training + AI-governance certification posture: Claude's ISO 42001 + Commercial Terms are attractive, provided you accept the Bedrock/Vertex EU deployment path.
- Developers / agents: both offer API + ZDR; Claude requires Bedrock/Vertex for EU residency, OpenAI's API supports eligible EU projects directly.
8 Disclaimer
This overview is intended solely as an informative tool and is not legal advice. We strongly advise customers to thoroughly review all Data Processing Agreements (DPAs) and privacy documentation before deploying Claude or ChatGPT in production environments - especially when personal data, proprietary business information, or confidential content are processed. WAIMAKERS applies this same principle internally; all tools we use have been thoroughly assessed and included in our own privacy and security documentation. Customers should always carefully evaluate the official documentation, terms, and DPAs of each AI provider they use. WAIMAKERS cannot be held legally liable for any mistakes, errors, inaccuracies, or for the accuracy, currency, or completeness of the information in this document; the ultimate responsibility for GDPR compliance rests with the customer.
References
OpenAI / ChatGPT:
- https://openai.com/enterprise-privacy - OpenAI Enterprise Privacy
- https://help.openai.com/en/articles/9903489-data-residency-for-chatgpt - Data residency and inference residency for ChatGPT
- https://help.openai.com/en/articles/10503543-data-residency-for-the-openai-api - Data Residency for the OpenAI API
- https://openai.com/policies/data-processing-addendum - OpenAI Data Processing Addendum (updated Jan 1, 2026)
Anthropic / Claude:
- https://www.anthropic.com/legal/commercial-terms - Anthropic Commercial Terms
- https://privacy.claude.com/en/articles/7996866-how-long-do-you-store-my-organization-s-data - Anthropic commercial data retention policy
- https://platform.claude.com/docs/en/build-with-claude/data-residency - Anthropic Data Residency Documentation
- https://trust.anthropic.com - Anthropic Trust Center (ISO 27001, ISO 42001, SOC 2)
Regulatory:
- https://www.garanteprivacy.it/ - Italy Garante €15M fine on OpenAI (Dec 2024); annulled by the Court of Rome (March 2026)
- https://www.edpb.europa.eu/ - EDPB Art. 64 Opinion on AI model training and personal data (Dec 2024)
Prepared and issued by WAIMAKERS B.V. - June 2026.