Microsoft Copilot adds GPT-6.1 Sol and Claude Sonnet 5.5 models

Microsoft Copilot begins rolling out OpenAI's GPT-6.1 Sol and Anthropic's Claude Sonnet 5.5 today, joining Claude Opus 5.5 and GPT-6 Sol added earlier this month.

Users can pick the model suited to each task, with Work IQ grounding responses in their files, meetings, and chats within existing permissions.

The rollout starts today in Copilot Cowork and Copilot Studio, with Word, Excel, PowerPoint, and Chat following in phases over the coming week.