GitHub Copilot removed six models, pointed users to GPT-6.1 Sol and Grok 4.7
GitHub removed six Copilot models from Chat, inline edits, agent mode and code completions on October 19, named a replacement for each, and told enterprise admins to approve the new models in Copilot policy before developers can pick them.
Image: GitHub
Why it mattersAny team that pinned a Copilot workflow or automation to one of the six names will fail silently until an admin approves the replacement, so check the model selector today before a scripted job quietly swaps models tomorrow.
A Copilot user who kept a chat open on GPT-5.4 or Grok 4.5 on Sunday opened it on Monday to find the model gone. GitHub removed six models from Copilot Chat, inline edits, ask and agent modes, and code completions on October 19, and the model picker no longer shows them.
GitHub names the removals and the replacements in its changelog entry. Gemini 3.7 Flash now points to Gemini 3.8 Flash. GPT-5.5 and GPT-5.4 both point to GPT-6.1 Sol. GPT-5.4 mini and GPT-5 mini both point to GPT-6 Luna. Grok 4.5 points to Grok 4.7. The old names are no longer selectable in Copilot settings.
What a developer sees
The changelog tells users to "update your workflows and integrations to use supported models." A Copilot Chat session, an inline-edit shortcut, or an agent-mode script that referenced one of the six names will either fail to resolve the model or swap it for the account default. A CI step that calls Copilot with a pinned model name is the quietest case: the step keeps running, the output changes, nobody is told why, and the first signal is a slow drift in review comments or test failures.
A team that compared GPT-5.4 against GPT-5.4 mini for cost loses that comparison. Both now point to one replacement each: GPT-6.1 Sol for the non-mini and GPT-6 Luna for the mini. The old prices and the old tokens-per-request figures carry no information about the new models.
What an admin has to do
The replacements do not appear in the picker on their own. GitHub says enterprise administrators have to "enable access to alternative models through their model policies in Copilot settings" and then verify availability through individual Copilot settings before developers see the new models. A team whose developers log in to Copilot Chat and see no replacement is usually a team whose admin has not approved it yet.
A removal like this is routine for Copilot: GitHub has done five of them already this year. The practical answer is to stop treating Copilot's named list as a fixed interface. Any configuration that writes a model name down should also write down the fallback, and any benchmark comparing Copilot models to a non-Copilot tool should be rerun against the current list before it is cited.
Source
GitHub Copilot models deprecated on October 19, 2026, the GitHub changelog.
This item was written by an AI system from the linked source. Reveneau is responsible for what it publishes.
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