---
title: "GitHub Copilot models deprecated: 2026-10-19 | Harbyn"
description: "GitHub Copilot models deprecated, effective Oct 19, 2026."
canonical: "https://harbyn.com/changes/github/2026-10-19-github-copilot-models-deprecated-on-october-19-2026"
last-updated: 2026-10-25
---

# GitHub Copilot models deprecated

Markdown version of <https://harbyn.com/changes/github/2026-10-19-github-copilot-models-deprecated-on-october-19-2026>.

Deprecation - GitHub. medium severity. In effect. History: recorded after the fact.

GitHub deprecated Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5 across most Copilot experiences on October 19. Move to Gemini 3.8 Flash, GPT-6.1 Sol, GPT-6 Luna or Grok 4.7 as appropriate; enterprise administrators may need to enable the alternatives.

The deadline passed on Oct 19, 2026.

## Facts

| Fact | Value |
| --- | --- |
| Vendor | [GitHub](https://harbyn.com/vendors/github.md) |
| Kind | Deprecation |
| Severity | medium |
| Status | In effect |
| Announced | Oct 19, 2026 |
| Effective | Oct 19, 2026 |
| Added to Harbyn | Oct 25, 2026 |
| Lead time | Recorded after the fact: added 6 days after the deadline |
| Symbols | `GPT-5.5`, `GPT-5.4` |
| Vendor page | <https://github.blog/changelog/2026-10-19-github-copilot-models-deprecated-on-october-19-2026> |
| Review | Reviewed by a person, extracted by a model |

## Find it in your code

```sh
npx harbyn scan
```

This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses GitHub, from its packages and API hosts. Nothing leaves your machine.

## Sources

Where this event comes from: the page we read, when we read it, and the hash of that snapshot.

- <https://github.blog/changelog/feed/> (changelog, fetched 2026-10-21 14:31 UTC, sha256 `53b365303c942fee23a6f670d1a1fb27530d96018bd40717a61a78ef7d38d365`)

## Related changes

### More from GitHub

- [Intel-based Mac support deprecation](https://harbyn.com/changes/github/2026-10-19-codeql-changes-for-macos-27-xcode-27-and-swift-6-4.md) (Deprecation, effective Dec 2026)
- [CodeQL tracing and Swift support changes](https://harbyn.com/changes/github/2026-10-19-codeql-changes-for-macos-27-xcode-27-and-swift-6-4-2.md) (Breaking change, announced Oct 19, 2026)
- [Some Git over HTTPS may temporarily require authentication](https://harbyn.com/changes/github/2026-10-19-some-git-over-https-may-temporarily-require-authentication.md) (Behavior change, announced Oct 19, 2026)
- [Dismissal-request webhooks include request number](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning.md) (Behavior change, announced Oct 20, 2026)

### Changes at other vendors

- [AWS Lambda: Python 3.10 runtime deprecation](https://harbyn.com/changes/aws-lambda/2026-10-08-python-3-10-runtime-deprecation.md) (effective Oct 31, 2026)
- [Jira / Atlassian Cloud: Atlassian Analytics dashboard subscriptions being removed](https://harbyn.com/changes/atlassian-jira/2026-08-10-atlassian-analytics-dashboard-subscriptions-being-removed.md) (effective Nov 2, 2026)
- [Google Cloud Run and Functions: .NET 8 runtime deprecation](https://harbyn.com/changes/google-cloud/2026-10-08-net-8-runtime-deprecation.md) (effective Nov 10, 2026)
- [Supabase: @supabase/server framework adapters are deprecated and will be removed on December 1, 2026](https://harbyn.com/changes/supabase/2026-10-05-framework-adapters-in-supabase-server-are-deprecated.md) (effective Dec 1, 2026)

[All upcoming deadlines](https://harbyn.com/deadlines.md)