AI writing assistant that doesn't train on my company's documents

Yes—Grammarly Business or Enterprise is a good fit if you want writing help inside documents, email, and browsers. Grammarly says training and product-improvement use is off by default for these organization plans. (support.grammarly.com)

Other business options:

• Microsoft 365 Copilot — useful if your company works in Microsoft 365; Microsoft says company data isn’t used to train its foundation models. (learn.microsoft.com)
• Claude for Work — Anthropic says it doesn’t use commercial-product inputs or outputs to train its models by default. (privacy.claude.com)
• ChatGPT Business or Enterprise — OpenAI says business data isn’t used for training by default. (openai.com)

Important: use the company/business plan, not a personal account, and have your IT or legal team review the vendor’s contract, retention settings, and data controls. “Not used to train models” doesn’t necessarily mean the service never stores or processes your documents.

Several mainstream tools have business tiers that exclude your inputs from model training by default. The main options:

• Claude Team, Enterprise, or API: Anthropic's commercial plans exclude business inputs and outputs from training by default, and organization owners can switch off the feedback button for everyone. Personal Free, Pro, and Max accounts are a different matter, since they can feed training when the setting is on. (source) One caveat: thumbs up/down feedback is an exception even on business plans, and that conversation can be kept for up to five years and used for training. (source)
• ChatGPT Business or Enterprise: OpenAI says it does not train on data from these plans or the API by default, and admins control retention on Enterprise. (source)
• Google Gemini for Workspace: Google offers enterprise commitments not to use customer data for training outside your organization. (source)
• Adobe Acrobat AI Assistant: Adobe says it does not use customer data to train or fine-tune its models. (source)
• TextCortex: Built for European data sovereignty, with GDPR compliance, SOC 2 certification, and a zero-training claim. (source)
• Writer: An enterprise platform that grounds responses in company data, though its data-use terms depend on the plan and configuration. (source)

Before you commit:

1. Get the no-training term in the contract or DPA. Vendor marketing and third-party blogs are not enough. Some vendors' protections apply only to certain tiers or depend on opt-out settings.
2. Check the retention period and feedback features. Training policy and data retention are separate questions.
3. Confirm security certifications such as SOC 2 Type II, plus a DPA if you're under GDPR.
4. Check the terms regularly. Anthropic changed its consumer training policy in September 2025, so policies can shift.

If you tell me your company size, region, and whether you need regulated-data compliance (HIPAA, GDPR, etc.), I can narrow this down.

To find an AI writing assistant that does not train on your company's documents, you must look beyond standard consumer versions of AI tools. Most "free" or individual-tier AI accounts use your prompts and uploads to improve their models by default.

However, enterprise-tier plans and private-by-design AI platforms are built specifically to prevent this.

1. The "Enterprise" Approach (Safest for Teams)

If your company already uses major platforms like OpenAI (ChatGPT) or Anthropic (Claude), you do not need to switch tools—you need to switch your account type.

• ChatGPT Enterprise / Team / API: OpenAI explicitly states that it does not train its models on data submitted to its enterprise, team, or API platforms. By default, these business-specific plans exclude your inputs and outputs from model training.
• Claude for Work / API: Similarly, Anthropic’s commercial products (Claude for Work and their API) are governed by terms that prohibit them from training on customer content.
• Microsoft Copilot (with Enterprise Data Protection): If your organization uses Microsoft 365, Copilot with Enterprise Data Protection (EDP) is designed to ensure that organizational data (prompts, responses, and file data) is never used to train foundational AI models.

Crucial Note: Ensure your team is actually signed into the company-managed workspace. Employees often mistakenly use their personal "Free" or "Plus" accounts for work, which do have training enabled by default unless manually disabled.

2. Private-by-Design & On-Premise Solutions

For highly regulated industries (finance, legal, government) where even cloud processing may be a concern, you can use tools that offer "zero-retention" or "on-premise" deployment:

• On-Premise / Local AI: Tools like Ollama, LM Studio, or GPT4All allow you to run models directly on your own hardware. Because the data never leaves your infrastructure, it cannot be used for external training.
• Specialized Enterprise Platforms: Platforms like VT Writer are built specifically for regulated industries and offer private cloud or on-premise deployment options. These tools are designed to keep data within your control and often include features like style guide enforcement and content compliance.
• Zero-Retention Services: Some providers offer "zero-retention" architectures where your prompts exist only in encrypted memory during processing and are never logged or stored.

How to Guarantee Privacy (A 3-Step Checklist)

Regardless of the tool you choose, follow these three steps to ensure your company data remains protected:

1. Verify the Contract (DPA): Do not rely on marketing pages alone. Check for a Data Processing Agreement (DPA) that explicitly states in writing that your data is not used for model training and defines clear retention/deletion policies.
2. Turn Off "Improvement" Settings: In any AI tool, go to "Settings," "Data Controls," or "Privacy" and ensure any setting labeled "Improve the model for everyone" or "Train on my data" is toggled OFF. If you cannot find this setting, assume the tool is not safe for sensitive data.
3. Implement Data Sanitization: Even with a secure, non-training tool, adopt a "clean" habit. Before pasting documents into an AI assistant, remove or replace:
   • Specific client names and sensitive personal data.
   • Hardcoded credentials or API keys.
   • Highly proprietary figures or unreleased financial information.

Recommendation: If you are a team, prioritize upgrading to the Business or Enterprise plan of your current preferred tool (ChatGPT or Claude) and enforce its use through your company’s IT/Security policy. If you require absolute isolation, explore self-hosted solutions like Ollama or PrivateGPT.

Two solid options:

• WRITER — Designed for enterprise writing and AI workflows. WRITER says it does not train its models on customer data and uses a zero-data-retention approach. ²³
• Grammarly Business or Enterprise — Offers writing assistance; Grammarly says content from these organizational plans is not used to train its models by default. ⁸

For sensitive company documents, use an organization-managed plan—not a personal/free account—and ask your IT or procurement team to confirm the terms, retention settings, and any exceptions in the contract. Policies can differ by plan.