Introducing the plugin registry for Microsoft Copilot
Introduction of the plugin registry for Microsoft Copilot, providing a centralized platform to discover and govern plugins.
EcosystemSource: Microsoft 365 Copilot Blog
Microsoft Copilot changelog: September 2026
10 releases from to
Everything Microsoft Copilot shipped in September 2026, collected from official Microsoft Copilot sources. Each entry is dated and links to the page it came from.
September 2026 at a glance
Microsoft Copilot in September 2026 introduced a plugin registry for managing extensions, added OpenAI's GPT-6.1 Sol and Claude Sonnet 5.5 models, and enhanced Planner with chat capabilities. It also improved Power BI filtering and Excel integration features.
Summary generated from the releases listed below.
September 2026 was Microsoft Copilot's busiest month of the 9 we had tracked by then: 10 releases, about 6.4× its monthly average of 2. That was 10 releases more than August 2026. Most were Product (8), followed by Ecosystem (1) and Model (1).
Releases
10
+10 vs August 2026
Rank of 9 months
1st
Average 1.6 a month
Most shipped
Product
8 releases
Notable Microsoft Copilot launches in September 2026
- Model
Availability of OpenAI's GPT-6.1 Sol and Claude Sonnet 5.5 in Microsoft Copilot
OpenAI's GPT-6.1 Sol and Claude Sonnet 5.5 are now available in Microsoft Copilot.
Source: Microsoft 365 Copilot Blog - Product
Unlocking Deeper Copilot Insights with Enhanced Power BI Filtering
Admins can enable additional attributes as filters in Power BI reports for more customized analytics
Source: Microsoft 365 Copilot Release Notes - Product
See email attachments as pills in Copilot search results
Email attachments now appear as pills directly on Copilot search results for quicker access
Source: Microsoft 365 Copilot Release Notes
All Microsoft Copilot releases in September 2026
Newest first. Each entry links to the official page it came from.
September 202610 releases
Availability of OpenAI's GPT-6.1 Sol and Claude Sonnet 5.5 in Microsoft Copilot
OpenAI's GPT-6.1 Sol and Claude Sonnet 5.5 are now available in Microsoft Copilot.
Unlocking Deeper Copilot Insights with Enhanced Power BI Filtering
Admins can enable additional attributes as filters in Power BI reports for more customized analytics
See email attachments as pills in Copilot search results
Email attachments now appear as pills directly on Copilot search results for quicker access
See Copilot usage in show changes pane
Users can now view Copilot usage details directly within the Show Changes pane in Excel.
Planner Agent chat
Planner integrates built-in chat with natural language Q&A and task management capabilities
New dedicated License Requests page in Microsoft 365 Admin Center
A new dedicated License Requests page in Microsoft 365 Admin Center for managing Copilot license requests
Navigate to your workbook changes directly from the Copilot chat pane response
In Copilot in Excel, the response contains links to highlight where changes are made in your workbook. Navigate directly to new sheets, tables, ranges, and objects like charts and shapes.
Find meetings based on topics and keywords
Copilot can now find meetings based on topics or keywords from meeting body, chat, and transcription data
"Sort by" filter for Outlook Mail in Copilot search
Users can sort Outlook Mail results by date in ascending or descending order within Copilot Search
Where September 2026 sits
Microsoft Copilot releases per month, for September 2026 and the 8 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.
Other companies in September 2026
26 of the companies we track shipped in September 2026; Microsoft Copilot ranks 6th by number of releases.
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