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GitHub Copilot Deprecates Legacy Models in October 2026
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Why it matters
- →Legacy model dependencies in automated workflows will break after October 2026.
- →Administrators must actively review model policies if global defaults were previously disabled.
- →Consolidation suggests GitHub is optimizing its inference stack for newer, more efficient models.
GitHub has announced the deprecation of selected legacy models across all Copilot experiences, including Chat, inline edits, and agent modes, effective October 19th, 2026. The changelog advises users to update workflows and integrations to use supported alternatives before this date. For Copilot Enterprise and Business customers, suggested alternative models are automatically enabled under default settings unless an administrator has explicitly disabled them. GitHub Enterprise customers with specific concerns are encouraged to contact their account team for assistance.
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