TL;DR: In July 2026, Microsoft turned Copilot into a true multi-model product, making OpenAI’s GPT-5.6 the default engine and adding Anthropic’s Claude as a selectable option inside Copilot Chat. INVITE Networks helps mid-market IT teams turn model-level changes like this into a governance checklist instead of a surprise. This is written for IT Directors and VPs of IT deciding how to respond to Copilot’s expanding model lineup. What actually changed in Microsoft 365 Copilot this month? Microsoft shipped more than 40 updates to Copilot in July 2026. Three matter most for IT leaders: GPT-5.6 became Copilot’s preferred model across Word, Excel, PowerPoint, Chat, and Cowork; Claude became a selectable model inside Copilot Chat for complex analysis and document work; and Copilot Cowork, Microsoft’s agentic work assistant, reached general availability. Microsoft also folded Copilot into permanent Business Standard and Business Premium plans on July 1. Why did Microsoft add GPT-5.6 and Claude as model options? Model choice is now a competitive feature, not a technical footnote. OpenAI has publicly called GPT-5.6 the preferred model for Copilot, and Microsoft added Claude for the same reason: staying competitive as Google’s Gemini gains ground in paid AI subscriptions. See Microsoft’s Copilot release notes for the full list. The practical result: the model answering a prompt in September may not be the one answering it today, and it can differ by app and by task. Does switching AI models change how Copilot handles your data? Not automatically, but it adds a variable worth checking. Different model providers carry different data retention and training-use terms, which is why frameworks like the NIST AI Risk Management Framework treat vendor-driven change as something governance has to account for, not just changes your own organization initiates. Before letting Copilot Chat default to a new model for finance, HR, or legal work, confirm through your Microsoft 365 admin center that it still meets your data handling requirements. Multi-model Copilot did not close any gaps you had in June. It added a setting to check. What should IT leaders do before rolling out these changes? Audit your Copilot admin settings. Confirm which models are enabled by default, for which apps, and who can change that. Update your AI governance policy. If it names “Copilot” as a single product, revise it to account for model choice. Brief department leads. Finance, legal, and HR should know outputs may now come from a different model than the one tested in pilot. Reassess your AI readiness baseline. A model change is a natural trigger to confirm your rollout plan still matches how the product works today. How does INVITE help mid-market teams manage Copilot change? INVITE Networks holds Microsoft partner status and has guided mid-market IT teams through Copilot deployment since its early rollout. Our AI Readiness Assessment framework, the same one behind our enterprise AI strategy guide, gives IT leaders a structured way to revisit governance and rollout decisions every time Microsoft changes the product, not only at initial deployment. Rather than reacting to each announcement individually, INVITE builds a standing review cadence into your AI strategy so updates like this one become a checklist item, not a fire drill. Frequently Asked Questions What is GPT-5.6, and why is it now Microsoft 365 Copilot’s preferred model? GPT-5.6 is OpenAI’s newest model release. Microsoft made it the default engine behind Copilot’s core apps in July 2026, so most prompts in Word, Excel, PowerPoint, and Chat now route to GPT-5.6 unless a user or admin picks a different option. Can employees choose Claude instead of GPT models in Copilot Chat? Yes. As of July 2026, Claude is a selectable model inside Copilot Chat, meant for complex analysis, document understanding, and structured content generation. Do the July 2026 Copilot changes affect data governance or security? Not automatically, but they add a variable. Different models can carry different data handling terms, so confirm through the Microsoft 365 admin center that any newly enabled model still meets your compliance requirements. Is Copilot Cowork the same product as Microsoft 365 Copilot? No. Copilot Cowork is Microsoft’s agentic work assistant, which reached general availability in July 2026. It requires a Copilot license and separate usage-based billing. What should IT leaders do differently now that Copilot supports multiple models? Treat model selection as an ongoing governance decision, not a one-time setup task. Review which models are enabled by default, confirm data handling terms for each, and build a recurring check into your AI governance policy instead of relying on pilot-stage settings. Microsoft will not be the last vendor to add model choice to a product your organization already depends on. INVITE Networks helps mid-market IT teams build an AI governance cadence that keeps pace with vendor changes instead of reacting to them one at a time. Talk to INVITE about building that cadence, or read our framework for building an enterprise AI strategy that holds up past the pilot stage.
