Technology | August 2026 | 4 min read
⚡ Quick Takeaways
⚡ Claude Opus 5 is now available via model selector in Word, Excel, PowerPoint, Copilot Chat, Copilot Cowork and Copilot Studio.
⚡ Microsoft first integrated Anthropic models in September 2025 — Opus 4.1 in Researcher and Sonnet 4 in Studio.
⚡ Copilot Chat: Opus 5 suited to open-ended problems, planning and complex reasoning.
⚡ Copilot Studio: businesses can build AI agents powered by Claude Opus 5 for workflows and multi-step tasks.
⚡ GPT-5.6 (added July 2026) remains available — Microsoft is explicitly building a multi-model platform.
Microsoft has expanded Anthropic’s Claude Opus 5 across its Microsoft 365 Copilot suite — making it available via model selector in Word, Excel, PowerPoint, Copilot Chat, Copilot Cowork and Copilot Studio. The move is part of Microsoft’s deliberate shift toward a multi-model Copilot platform, where users and enterprise administrators can choose between Claude and OpenAI’s GPT models depending on the task. GPT-5.6, added in July 2026, remains available alongside Claude.
| In M365
Claude Opus 5 Word, Excel, PPT, Chat, Cowork, Studio |
Also In M365
GPT-5.6 Added July 2026 — still available |
Sep 2025
First Claude Opus 4.1 in Researcher agent |
Claude in Microsoft 365 — Where It Is Now
| App / Surface | Claude Capability |
| Microsoft Word | Claude Opus 5 via model selector |
| Microsoft Excel | Claude Opus 5 via model selector |
| Microsoft PowerPoint | Claude Opus 5 via model selector |
| Copilot Chat | Claude Opus 5 — open-ended problems, planning, multi-option reasoning |
| Copilot Cowork | Claude Opus 5 — longer-running projects with multiple files and tools |
| Copilot Studio | Claude Opus 5 — build AI agents for reasoning, workflow automation, multi-step tasks |
| Researcher Agent | Claude models (admin-enabled) — web, files, emails, meetings, chats |
| ℹ️ Model Selector in Word and Excel — First Time Users Can Choose the Underlying AI The model selector in Word, Excel and PowerPoint is a meaningful shift for knowledge workers. Previously, Copilot in these apps ran exclusively on Microsoft’s default model — users had no control over which AI engine processed their requests. The model selector gives users the ability to choose Claude for tasks where it performs better — long-form document drafting, complex reasoning, nuanced editing — while keeping GPT available for other tasks. This is an enterprise-facing capability: most M365 Copilot users are business subscribers, not consumers. |
Integration Timeline
| Date | Milestone |
| Sep 2025 | Claude Opus 4.1 added to Researcher agent; Claude Opus 4.1 and Sonnet 4 added to Copilot Studio |
| Jul 2026 | GPT-5.6 added to Microsoft 365 Copilot |
| Aug 2026 | Claude Opus 5 expanded to Word, Excel, PowerPoint, Copilot Chat, Copilot Cowork and Copilot Studio |
Microsoft’s Multi-Model Strategy — What It Means
The expansion of Claude Opus 5 alongside GPT-5.6 confirms that Microsoft is deliberately not committing Copilot to a single AI provider. This is a strategic platform decision: by supporting multiple frontier models, Microsoft reduces its dependence on any single vendor, can offer users best-in-class performance for different task types, and positions Copilot as a model-agnostic productivity layer rather than an OpenAI distribution channel.
For enterprise administrators — who control which models are enabled for their organisations — the choice between Claude and GPT is now a real capability decision with material implications for the quality of AI-assisted work. Research tasks, long-document analysis and complex multi-step reasoning are areas where Claude’s architecture has shown benchmark advantages over GPT. Copilot Studio agents built on Claude Opus 5 for workflow automation can be designed for the specific reasoning profile that suits the task.
| ℹ️ Multi-Model Despite OpenAI Investment — Platform Breadth Over Exclusive Lock-In Microsoft’s investment in OpenAI remains substantial — billions of dollars and deep Azure infrastructure integration. The decision to expand Claude integration despite this investment signals that Microsoft believes the enterprise AI market will be won on breadth and flexibility rather than on exclusive access to a single model. This is consistent with how enterprise software markets typically mature: buyers want best-of-breed options, not lock-in. Microsoft is betting that Copilot as a platform wins even if OpenAI is not always the best model for every task. |
Disclaimer: Details from Microsoft’s official announcement. Claude model availability in Copilot apps may require Microsoft 365 Copilot licences and, in some cases, administrator enablement. Anthropic (Anthropic PBC) develops Claude — this article describes integration in Microsoft’s products, not a change to Claude.ai or Anthropic’s direct offerings.
