Private AI Isn't a Model Choice. It's an Information Boundary.
Most AI conversations focus on which model to use. The real question is: where does your data flow when you use it?
Cabrillo Club
December 24, 2025
The Model Conversation is a Distraction
When organizations discuss AI adoption, the conversation usually starts with: "Which model should we use? GPT-5? Claude? Grok? An open-source alternative?"
This is the wrong first question.
The model is a capability decision. The information boundary is a risk decision. One affects what you can do. The other affects what can go wrong.
What is an Information Boundary?
An information boundary defines where your data can flow. It includes:
- Your infrastructure - servers, cloud accounts, and storage you control
- Authorized third-party services - explicitly approved external systems
- The controls governing movement - policies, logging, and access restrictions
For regulated organizations, this boundary often needs to align with compliance frameworks. NIST 800-171 3.1.3 requires organizations to "control the flow of CUI in accordance with approved authorizations." You can't control what you don't see.
The Shadow AI Problem
Here's what most executives don't know: AI is already inside their organization. It arrived through:
- Browser extensions that send text to external APIs
- Personal ChatGPT accounts used for work tasks
- SaaS tools that quietly added "AI features" using external inference
- Developers testing code against public AI services
Each of these represents an uncontrolled information flow. Data leaves your boundary. You have no audit trail. Compliance becomes a question mark.
Why "Private AI" Isn't Just On-Premise
Private AI is often confused with on-premise deployment. They're related but not identical.
On-premise deployment means the AI runs on infrastructure you physically control.
Private AI means the information boundary is defined and governed. This can include:
- On-premise inference for sensitive data
- VPC deployment in your cloud account for flexibility
- Governed external model usage for non-sensitive workloads
- Complete audit trails regardless of where processing happens
The key isn't where the model runs. It's whether you control the boundary.
The Three Questions
Before you choose a model, answer these:
- Where does your data go? Can you trace every prompt and response to its destination?
- Who can see it? Which third parties have access to your AI interactions?
- What's logged? Can you produce an audit trail for compliance review?
If you can't answer these questions, you don't have private AI. You have AI with unknown boundaries.
Building the Boundary
Establishing a controlled information boundary doesn't mean abandoning AI. It means adopting it deliberately:
- Stabilize control first. Define what data flows where. Set up logging before AI touches sensitive information.
- Start with the money path. Deploy AI where it creates immediate value - proposals, executive briefings, customer intelligence.
- Compound over time. Expand automation. Add memory. Refine governance. Each cycle makes the system smarter and more controlled.
The Compliance Clock
For defense contractors and regulated industries, the urgency is real:
- CMMC 2.0 enforcement is progressing through phased implementation
- Unmanaged AI creates governance blind spots that auditors will find
- Retrofitting compliance after the fact costs 10x more than building it in
The organizations that establish controlled AI boundaries now will compound advantage. Those that wait will be retrofitting under pressure.
FAQ
What is an information boundary?
An information boundary defines where your data can flow. It includes your infrastructure, authorized third-party services, and the controls governing data movement between them. For regulated organizations, this boundary often needs to align with compliance frameworks like NIST 800-171.
Can I use cloud AI and still have a private boundary?
Yes, with proper controls. The key is governance: explicitly defining which data can flow to external services, logging all interactions, and maintaining the ability to audit. Some organizations use external models for non-sensitive workloads while keeping CUI and sensitive data within on-premise inference.
How do I know if my current AI usage is a problem?
Ask three questions: (1) Do you know which AI tools your team uses? (2) Can you audit what data has been sent to external AI services? (3) Would your compliance officer be comfortable with the answers? If any answer is no, you likely have an information boundary problem.
What does it take to deploy private AI?
Modern private AI deployment is more accessible than most assume. A typical pilot takes 14 days and includes: infrastructure setup within your boundary, one automated workflow in production, audit trail configuration, and a rollout plan for expansion.
Next Steps
If you're ready to establish your information boundary, start with an assessment. In 25 minutes, we'll map your current AI usage, identify boundary gaps, and outline a path to controlled deployment.
Ready to define your information boundary?
Get a Security & Automation Assessment. 25 minutes. You leave with a plan.
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