Communication & Synthesis
OpenAI's conversational AI for writing, research, coding, and everyday productivity.
From $20 / mo
Visit WebsiteProductivity Engines
AI assistant embedded in Word, Excel, PowerPoint, Outlook, and Teams for Microsoft 365 workplaces.
From $30 / mo
Visit Website4-P Sovereignty Matrix
Lumen Trust Notes
ChatGPT
ChatGPT is fully cloud-based with no local processing; all inputs are handled on OpenAI servers, making data sovereignty low. Its mission centres on broadly beneficial AI, with transparent safety research and a strong free tier that democratises access. Recommended for general productivity, writing, and research — avoid sharing sensitive PII or confidential commercial data.
Microsoft 365 Copilot
Copilot processes prompts and organisational content in Microsoft's cloud; enterprise controls and compliance certifications exist, but there is no local-first option for standard M365 Copilot, keeping Privacy Low. Per-seat business pricing and licence prerequisites limit access parity for individuals and small teams. Purpose is High—it meaningfully accelerates real office workflows inside apps people already use. Closed models and opaque training details keep Provenance Low. Best for Microsoft-centric orgs with clear data-governance policies.
Pricing
ChatGPT
From $20 / month
Microsoft 365 Copilot
From $30 / month
Disclaimer
Scores are based on publicly available information and Lumen's auditing criteria at the time of assessment. They may not reflect recent changes.
This comparison is not a legal or security audit. Read our full disclaimer.