Choosing a company AI platform is a trade-off between governance and productivity. In our experience, Claude is probably the most productive of the three and the hardest to govern, ChatGPT is close behind on productivity with somewhat more mature admin controls, and Microsoft 365 Copilot is the most secure starting point for Microsoft organizations but the hardest to build in. None of the three gives you true zero data retention in its standard business chat product.
That's Mosaic's view from rolling these tools out with clients, not a benchmark. The product facts below are current as of October 2026 and linked to their sources, because these platforms change monthly.
Why is this a governance vs. productivity decision?
Every AI platform makes the same bargain: the more it can do on its own (read your files, connect to your systems, take actions, build things you can share), the more there is to configure and watch. A tool that can only answer questions inside your email is easy to govern and limited. A tool that can run on your desktop, work across your systems and turn a good idea into something the whole team can use is powerful, and every one of those abilities is a setting someone has to get right.
So the honest question isn't "which is best?" It's "how much capability can we govern well right now?"
How do ChatGPT, Claude and Copilot compare?
For business use, ChatGPT, Claude and Microsoft 365 Copilot differ less in raw intelligence than in how much they let people build and how easily they can be governed. Microsoft 365 Copilot runs inside your Microsoft tenant, respects the permissions and compliance settings you already have, and is the safest place for a Microsoft-based organization to start, but it is the hardest of the three to build new workflows and shareable tools in. Claude is, in our experience, the most productive for people who build, and has the most surfaces to configure. ChatGPT sits close to Claude on productivity, with longer-standing role-based controls on its Enterprise plan. All three keep business data out of model training by default. None offers zero data retention in its standard business chat product as of October 2026. The right choice depends on your industry, your Microsoft footprint and how much your people will build.
| Claude (Team / Enterprise) | ChatGPT (Business / Enterprise) | Microsoft 365 Copilot | |
|---|---|---|---|
| Governance controls | Custom roles by group on Enterprise; broad surface to configure (chat, desktop agent, Claude Code, connectors) | Mature role-based access controls on Enterprise; simpler roles on Business | Runs inside your Microsoft 365 tenant with existing permissions, Purview labels and admin-approved agents |
| Data handling and retention | No training on business data by default; Enterprise retention minimum 30 days; no ZDR for chat | No training on business data by default; Enterprise retention minimum 90 days; ZDR for approved API use | Not used to train foundation models; stored under your Microsoft 365 commitments; retention set in Purview |
| Productivity and building | Strongest, in our view; easiest to turn ideas into shareable tools and workflows | Close to Claude; strong agents, custom GPTs and Codex | Good for everyday drafting and summarizing in Office; harder to build and share new things |
| Best for | Teams that build, with clear rules and an admin who will configure it | Teams that build and want somewhat more admin control | Regulated or Microsoft-centric organizations starting out |
Claude: the most productive, and the hardest to govern
In our client work, Claude is where people most often go from "this helped me" to "this is now how the team does it." Its desktop app, skills, connectors and agentic tools make it unusually easy to turn one person's idea into something shareable.
That same breadth is why we call it the hardest to govern. It isn't that the controls don't exist: Anthropic now offers custom roles on Claude Enterprise that can switch features, models and individual connector tools on or off by group. It's that there are more surfaces to get right, and an agent that can act on your desktop or your systems deserves more care than a chat window.
On data, Anthropic states that it doesn't train on inputs or outputs from its commercial products by default. Claude Enterprise owners can set a custom retention period with a 30-day minimum. Anthropic's privacy center notes that Claude chat and Cowork under Enterprise operate with standard retention; zero data retention applies to API workspaces and to Claude Code under Enterprise, by arrangement.
ChatGPT: close behind, with more mature admin controls
ChatGPT is close to Claude on productivity and helps people quite a bit, especially with agents, custom GPTs shared across a workspace and Codex for technical teams. Where it has had the edge is administration. OpenAI's role-based access controls let admins turn features on or off by role, and they've been in place longer. One correction to a common assumption: those custom roles are an Enterprise and Edu feature. ChatGPT Business has simpler owner, admin and member roles.
According to OpenAI's admin guidance, OpenAI doesn't use content from ChatGPT Business or Enterprise to train its models by default, and Enterprise owners can set a workspace retention policy with a 90-day minimum. Zero data retention exists, but for the API, approved case by case, not as a ChatGPT setting.
Why doesn't either one give you zero data retention?
Many organizations, especially in legal, financial services and healthcare, start this conversation asking for zero data retention (ZDR): the provider keeps nothing once a request is processed. As of October 2026, neither ChatGPT nor Claude offers that in their standard business chat products. Both keep conversations so you can see your history, and both let Enterprise customers shorten how long that lasts. ZDR is real, but it lives mostly in API agreements and specific enterprise arrangements, which is a different way of using these models than a chat app.
If ZDR is a hard requirement, you're likely looking at an API-based tool built for your use case, or at a platform where retention is governed by contracts you already have.
Copilot: the secure, natural entry point
For most Microsoft 365 organizations, Copilot is the natural first step. Per Microsoft's documentation, it only surfaces content each user already has at least view permission for, honors Purview sensitivity labels and encryption, doesn't use prompts or responses to train foundation models, and lets admins set retention for Copilot interactions in Microsoft Purview. Admins also choose which agents are allowed. Microsoft also offers Anthropic's Claude models inside Copilot as an admin option, and in 2026 launched Copilot Cowork, built with Anthropic.
So why isn't it the obvious winner? In our experience, Copilot limits how easily your people can turn ideas into automations or shareable tools the whole team benefits from. It has an agent builder, but building there is harder. And even when it runs the same underlying models, Copilot's harness (the app and features around the model) has felt less capable to us than Claude's or ChatGPT's.
Cross-device work is a clear example. In 2026, OpenAI let people steer Codex sessions on their computer from the ChatGPT phone app, and Anthropic introduced Dispatch, which lets you hand Claude a task from your phone and have it finish on your desktop. We haven't seen Microsoft ship an equivalent yet. Microsoft is behind there.
How should your organization choose?
- Regulated and already on Microsoft 365? Start with Copilot. It's the shortest path to safe, everyday use, and your existing permissions and compliance tools carry over.
- A team that builds? Choose Claude or ChatGPT on a business plan, with clear rules about data and an admin who will actually configure it.
- Somewhere in between? Many organizations end up with one primary platform for everyone and a governed second platform for the smaller group that builds.
Whatever you pick, remember that safe is a configuration, not a property. The one thing to get right first is consumer vs. business accounts. Consumer plans on both ChatGPT and Claude can use your conversations for training unless the user opts out; business plans don't by default. An employee pasting client data into a personal account is your real risk, which is why we argue IT should make the safe path the easy one in Shadow AI. For a deeper look at one platform in a regulated setting, see Is Claude safe for legal work?
If you want help choosing and configuring a platform, that's part of our AI strategy and vendor evaluation work. We're independent of all three vendors, and our Advise, Educate & Lead service includes rollout and training once you've chosen.