Microsoft is expanding the capabilities of Microsoft 365 Copilot by bringing Anthropic’s Claude Opus 5 model to more of its productivity applications. The move gives users greater flexibility when choosing an AI model for tasks such as research, planning, writing, analysis and workflow automation. Instead of relying on a single AI provider, Microsoft is increasingly allowing users and organizations to select the model that best fits their needs.
Microsoft’s Growing Claude Partnership
Microsoft first introduced Anthropic models into its Copilot ecosystem in September 2025. At that time, Claude Opus 4.1 was made available through the Researcher agent, while Claude Opus 4.1 and Sonnet 4 were integrated into Copilot Studio.
Since then, Microsoft has significantly expanded its support for Claude. The latest update makes Claude Opus 5 available through the model selector in Word, Excel, PowerPoint, Copilot Chat, Copilot Cowork and Copilot Studio.
This expansion represents a major development in Microsoft’s approach to workplace AI. Rather than limiting customers to models from one provider, the company is building Copilot into a platform where different AI systems can be used according to the requirements of individual tasks.
Claude Opus 5 Comes to More Apps
Users of Microsoft 365 Copilot can now select Claude Opus 5 in several applications, giving them another option for demanding AI-assisted work.
In Copilot Chat, Microsoft says Claude Opus 5 is particularly useful for open-ended problems, planning, comparing alternatives and tasks that require advanced reasoning. These capabilities could be useful for professionals who need to evaluate complex information before making decisions.
Copilot Cowork is designed for longer-running projects that involve multiple files and tools. With Claude Opus 5 available, users can potentially use the model for projects requiring extended reasoning and coordination across different sources.
Copilot Studio provides another important use case. Businesses can use the platform to create AI agents powered by Claude Opus 5. These agents can support reasoning, automate workflows and complete multi-step business processes.
Microsoft Embraces a Multi-Model Strategy
The addition of Claude Opus 5 highlights Microsoft’s broader multi-model strategy.
Microsoft continues to work closely with OpenAI and provides GPT models throughout its AI ecosystem. GPT-5.6 was added to Microsoft 365 Copilot in July 2026, showing that Microsoft’s relationship with OpenAI remains an important part of its AI strategy.
At the same time, the company is giving customers more choices. The result is a Copilot environment where users can potentially select different models depending on the nature of their work.
This approach could become increasingly important as AI models develop different strengths. One model might perform better for a particular type of reasoning task, while another could be more suitable for coding, writing, research or automation.
Claude Also Expands in Researcher
Microsoft’s Researcher agent is another area where the multi-model approach is becoming visible.
The agent supports both GPT and Claude models, with administrators able to enable Anthropic models for users. This allows Claude to assist with complex research involving information from the web as well as organizational data.
That organizational data can include files, emails, meetings and chats. Bringing multiple sources together can make AI research more useful for employees who need to understand large amounts of company information.
For businesses, model choice could therefore become more than a technical feature. It may allow organizations to select AI systems based on performance, workflow requirements, security considerations and the nature of their data.
What the Expansion Means for Users
The growing availability of Claude within Microsoft 365 Copilot gives users greater control over how they work with artificial intelligence.
Previously, users often had limited visibility into which underlying model powered an AI feature. Microsoft’s model selector changes that approach by allowing eligible users to choose between available systems.
For organizations, the development could also reduce dependence on a single AI model provider. If different models are available through the same Copilot environment, companies can experiment with their capabilities without completely changing their existing productivity workflows.
However, the availability of Claude models may depend on administrator settings, subscriptions and the specific Microsoft 365 features available to an organization.
A More Competitive AI Workplace
Microsoft’s expanded Claude integration shows how quickly the enterprise AI market is changing. Companies are increasingly moving toward environments where multiple AI models can operate within the same platform.
For Microsoft, this strategy allows Copilot to benefit from developments across the broader AI industry while maintaining its relationship with OpenAI.
For customers, the biggest advantage is choice. Microsoft 365 Copilot is becoming less about a single underlying AI model and more about providing access to different models for different jobs.
As AI systems become more specialized, that flexibility could become one of the most important features of workplace productivity platforms. Microsoft’s decision to expand Claude Opus 5 across Word, Excel, PowerPoint and other Copilot tools suggests that model choice will remain a central part of its AI strategy.
