{"type":"post","id":"visual-studio-2026-18-12-runs-copilot-chat-55cb95","slug":"visual-studio-2026-18-12-runs-copilot-chat-55cb95","title":"Visual Studio 2026 18.12 runs Copilot Chat on the Microsoft Copilot SDK by default","description":"Visual Studio 2026 version 18.12 switches Copilot Chat to the Microsoft Copilot SDK by default, bringing the same agent harness used in GitHub Copilot CLI, the GitHub Copilot app and VS Code.","retrieval_nugget":"Visual Studio 2026 version 18.12 switches Copilot Chat to the Microsoft Copilot SDK by default, bringing the same agent harness used in GitHub Copilot CLI, the GitHub Copilot app and VS Code.","published_at":"2026-11-14","updated_at":"2026-11-14","record_date":"2026-11-14","date_kind":"published_at","topics":["github","agent-harness"],"entities":["Microsoft","Visual Studio","Microsoft Copilot SDK","GitHub Copilot CLI","GitHub Copilot","Dalia Abo Sheasha"],"related_patterns":["harness-architecture-outlives-model-choice"],"novelty_label":"new_fact","what_changed":"Visual Studio 2026 version 18.12 now runs Copilot Chat on the Microsoft Copilot SDK by default, with reported improvements in task-solving performance and chat controls.","prior_refs":["https://newruntime.com/posts/github-copilot-sdk-is-being-transitioned-to-microsoft-d84574/"],"source_url":"https://devblogs.microsoft.com/visualstudio/copilot-in-visual-studio-just-got-a-major-upgrade","source_urls":["https://devblogs.microsoft.com/visualstudio/copilot-in-visual-studio-just-got-a-major-upgrade"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:visual-studio-2026-18-12-runs-copilot-chat-55cb95","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/visual-studio-2026-18-12-runs-copilot-chat-55cb95/","markdown":"https://newruntime.com/posts/visual-studio-2026-18-12-runs-copilot-chat-55cb95.md","json":"https://newruntime.com/posts/visual-studio-2026-18-12-runs-copilot-chat-55cb95.json"},"markdown_url":"https://newruntime.com/posts/visual-studio-2026-18-12-runs-copilot-chat-55cb95.md","next_reads":[{"type":"topic","path":"/topics/github/","url":"https://newruntime.com/topics/github/","title":"Github","reason":"Explore the github topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/github.md","json_url":"https://newruntime.com/topics/github.json"},{"type":"topic","path":"/topics/agent-harness/","url":"https://newruntime.com/topics/agent-harness/","title":"Agent Harness","reason":"Explore the agent-harness topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-harness.md","json_url":"https://newruntime.com/topics/agent-harness.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/sources/","url":"https://newruntime.com/sources/","title":"Sources","reason":"See the original sources this archive cites.","media_type":"text/html"}]}