Devin 2026.09.21

Devin 2026.09.21 was released on .

Summary

SWE-2 Research Preview in the Agent Selector SWE-2, Cognition's next-generation software engineering model, is rolling out as a research preview in the agent selector under the "Research preview" s...

Release Context

  • This was the 5th Devin release of 2026 tracked by Havoptic.
  • It shipped 3 days after Devin 2026.09.18 (September 18, 2026).

Shipped around the same time

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Release Notes

SWE-2 Research Preview in the Agent Selector SWE-2, Cognition's next-generation software engineering model, is rolling out as a research preview in the agent selector under the "Research preview" section. Choose SWE-2 and a reasoning effort (Medium, High, or Max) when starting a session, or switch to it mid-session with the agent toggle next to the message input; in Slack, use !swe2. Enterprise admins enable SWE-2 (Preview) for their enterprise in Settings, and organization admins can then turn it on or off for their organization under Agent capabilities. As a research preview, behavior and availability may change. Attach a Folder to a Message You can now attach a whole folder to a Devin message by dropping it on the composer or choosing "Upload folder". The folder is compressed in your browser and attached as a single zip file. More Automatic Merge-Conflict Fixes Devin now fixes merge conflicts on its PRs automatically more often: within 12 hours of session activity (36 hours if the PR is approved), including conflicts that reappear after an earlier one was fixed. Shell Command Durations in the Worklog Finished shell commands in the session worklog now show how long they took, so slow commands are easy to spot. Full Links for PRs, Issues, and Commits Devin now links PRs, issues, and commits it mentions instead of writing bare numbers like 123. File Tree, Smart Diffs, and Open in Editor in the PR Tab The PR tab now has a file tree alongside the diff that highlights the current file as you scroll, a Smart diffs toggle in the diff settings to view a PR as a flat list of files, an "Open in editor" button, and a "File tree on left" option to move the changed-files tree to the left of the diffs. Checks Tab and Faster Diffs The PR tab has a new Checks tab showing CI status, with tabs ordered Changes, Description, Discussion, Commits, Checks, Bugs. Diffs highlight faster and scrolling large PRs is smoother, and the embedded editor now matches the diff viewer's fonts and colors. Devin Review in Spanish and Portuguese Devin Review's interface is now available in Spanish and Portuguese for users whose display language is set to Español or Português. Devin Review for Bitbucket Data Center Devin Review can be enabled for Bitbucket Data Center repositories, including automatic reviews when pull requests are opened or updated. Bitbucket Data Center projects and repos can be selected on the Devin Review home page, the merge bar shows merge, approval, and build status, and admins can configure a webhook (Settings › Integrations › Bitbucket) so Devin updates pull request status and comments in near real time. npx devin-review CLI Retired The standalone npx devin-review command-line tool and its unauthenticated review page have been removed. Use Devin Review on the PR tab or in the Devin Review home instead; existing installed copies of the CLI will no longer work. Azure DevOps Improvements Devin can now add and remove pull request labels (tags) on Azure DevOps and Azure DevOps Server. In Settings, Azure DevOps connections show the organization name, and organizations or Server collections with more than 100 projects now list repositories from every project. Rotate Bitbucket Data Center Tokens Admins can rotate a Bitbucket Data Center connection's HTTP access token from Settings → Bitbucket or the enterprise API without disconnecting; the new token must belong to the same Bitbucket user. Link Your Bitbucket Data Center Account Once an admin registers an OAuth application for a Bitbucket Data Center host, you can link your own Bitbucket account from Devin Review or Profile → Linked accounts. Review approvals and comments Devin posts on that host are then attributed to you rather than the shared connection. Microsoft 365 MCP Servers and Plugins Microsoft 365 Mail & Contacts, Calendar, To Do, OneDrive & SharePoint, Teams, and Directory (Entra ID) are now available in the MCP marketplace and as plugins that bundle each MCP server with a usage skill. Connect them with your own Microsoft Entra app registration, pick OAuth scopes from a list that explains what each permission is for, and Devin connects with read-only permissions by default when no scope is configured. The Files MCP can return files converted to PDF or JPG. Google Workspace MCPs Through Plugins Gmail, Google Drive, and Google Calendar MCPs installed through a plugin can now be connected with your own Google OAuth client ID and secret, including custom OAuth scope and resource. On plugin MCPs that need your own OAuth client, the client ID and secret fields now appear first. Personal MCP Servers Are Private MCP servers you add or install from the Personal tab in Customize are now private to you instead of being shared with your organization, and editing a personal MCP server more than once no longer fails. Devin Can Manage Org and Enterprise Plugins Org and enterprise admins can have Devin create, update, remove, and install plugins for their whole organization or enterprise, approving each change. Devin can also create, update, and remove skills, rules, MCP servers, and hooks in your uploaded personal plugins through a single tool, including plugins that use a root mcp.json. Required and Available-to-Install Plugins Org and enterprise admins can make uploaded plugins "Available to install" so members choose whether to add them, or "Required", from the plugin's card or details panel. Renaming a plugin updates its name across Customize, Marketplace, and the session plugins menu, plugin indexing errors on the Customize page now say what actually failed, and plugins can be up to 5x larger (20 MiB, 2,500 files). Simpler Create Automation Menu The Create automation menu is reordered, "Manual" is now "Create", and "Suggest automations" is now "Suggest for me". Reactivated SCIM Users Keep Their Groups SCIM users who are deactivated and later reactivated by the identity provider now keep their IdP group membership...

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