More LLM Models Available in M365 Copilot

M365 Copilot capabilities are landing in the cloud at a rapid pace.  

On May 2nd, I wrote about Anthropic Claude Opus 4.7, GPT 5.5 Thinking, and ChatGPT Images 2.0 models are now available: https://www.astaticstate.com/2026/05/new-models-available-for-m365-copilot.html

Fast forward today, we have five more updated models added.

GPT-5.5 Instant

Microsoft's fast-response model for everyday work, optimized to provide more accurate, concise answers with improved image analysis and STEM capabilities while reducing unnecessary verbosity and follow-up questions.

Reference: https://techcommunity.microsoft.com/blog/microsoft365copilotblog/available-today-gpt-5-5-instant-in-microsoft-365-copilot/4517084

Anthropic Claude Opus 4.8

Optus 4.8 is designed for complex, multi-step coding tasks and long-horizon agent work with improved tool selection and closer adherence to following instructions.  Plus it is also stronger at drafting documents, data analysis and presentations when combined with Work IQ.

Reference: https://techcommunity.microsoft.com/blog/microsoft365copilotblog/available-today-anthropic-claude-opus-4-8-in-microsoft-365-copilot/4523405

Anthropic Claude Fable 5

Claude Fable 5 is Anthropic's most advanced model for tackling complex, multi-step knowledge work, research and analysis. When used in Microsoft 365 Copilot, it combines Fable 5's reasoning capabilities with Copilot's access to organizational context from emails, files, meetings, and chats to help users complete more sophisticated work.

Reference: https://techcommunity.microsoft.com/blog/microsoft365copilotblog/available-today-anthropic-claude-fable-5-in-microsoft-365-copilot/4526832

Anthropic’s Claude Sonnet 5

Anthropic's Claude Sonnet 5 is a frontier AI model available in Microsoft 365 Copilot that is optimized for agentic designed for agentic work across documents, spreadsheets, and presentations. When combined with Copilot's Work IQ grounding, it can reason over your organization's files, meetings, chats, and business data to help plan, create, and refine high-quality work products while staying within the Microsoft 365 Copilot experience.

Reference: https://techcommunity.microsoft.com/blog/microsoft365copilotblog/available-today-anthropic%E2%80%99s-claude-sonnet-5-in-microsoft-365-copilot/4532188

OpenAI GPT-5.6

OpenAI's GPT-5.6 is now available in Microsoft 365 Copilot across Word, Excel, PowerPoint, Copilot Chat, and Copilot Cowork, where it has been optimized specifically for knowledge work and is the preferred model for many Copilot experiences.

Reference: https://techcommunity.microsoft.com/blog/microsoft365copilotblog/available-today-openai%E2%80%99s-gpt-5-6-in-microsoft-365-copilot/4533152