Private AI vs ChatGPT for law firms
Short answer
ChatGPT is quick to start and costs about $20–25 per seat per month. A private system costs more up front, but documents are processed on a server your firm controls. The better choice depends on which documents you plan to use and how many people will use them.
Side by side
| Item | ChatGPT Business | MyOfAI Box |
|---|---|---|
| Where documents are processed | The vendor's systems | A server in your office |
| Price | About $20–25 per seat per month (annual or monthly billing) | Setup from $3,000, support from $500 a month |
| Seat minimum | Check the vendor's current plan | None |
| Admin access | The vendor runs the service | Yours from day one |
| Accuracy | Leading cloud models can score higher on some legal benchmarks | Open models do well at search, summaries and reviewed drafts. We test on your documents first |
| Supervision duty | Remains with your firm | Remains with your firm |
Checked November 2, 2026. Vendor prices change and vary by contract. Names are trademarks of their owners; we are not affiliated with them.
Sources: ChatGPT Business pricing summary, October 2026 · Casefleet: legal AI pricing
Which fits your firm
Cloud may fit better if
- Staff will not use confidential documents
- You have a few users
- You need the newest models
Private may fit better if
- Some documents should not leave your control
- You want a flat monthly cost
- You want to document exactly where data goes