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Three model retirements land between September 30 and October 2. The one most likely to catch you is not on the maker's page.

4 min read

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Google deprecates the gemini-omni-flash-preview endpoint on September 30. OpenAI removes gpt-5.4-cyber from its API on October 1. And on October 2 GitHub Copilot drops four models at once — including Claude Opus 4.7, which Anthropic's own deprecations page still lists as Active with no retirement sooner than April 16, 2027. Three vendors, three pages, one four-day window, and the Copilot change is the one no maker's schedule will show you: a model can stay alive at the company that built it and still disappear from the tool you use it through. Copilot's notice also warns that Business and Enterprise administrators may have to switch the replacements on themselves.

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Three retirements come due in the same four days, from three companies that do not coordinate their schedules. If your code or your team's editor names any of the models below, the date is the one to put in a calendar — and for the last group, the maker's own page will tell you everything is fine.

The window

Date What goes Where The vendor names instead
Sep 30 gemini-omni-flash-preview Gemini API gemini-omni-1.1-flash
Oct 1 gpt-5.4-cyber OpenAI API gpt-5.6-cyber
Oct 2 Claude Opus 4.7, Gemini 3.5 Flash, Gemini 3.6 Flash, Kimi K2.7 Code GitHub Copilot Claude Opus 5, Gemini 3.8 Flash, Kimi K3

Google put it in the Gemini API changelog on August 27, the same day it released the general-availability version: "The existing gemini-omni-flash-preview endpoint will be deprecated on September 30, 2026."

OpenAI added a section to its deprecations ledger dated September 11: "The gpt-5.4-cyber model is deprecated and will be removed from the API on October 1, 2026. Migrate to gpt-5.6-cyber before the shutdown date."

GitHub posted on September 3 that it "will deprecate the following models across all GitHub Copilot experiences (including Copilot Chat, inline edits, ask and agent modes, and code completions) on October 2nd, 2026" — then a table of four models, each with a suggested alternative.

The one no maker's page will show you

Look up Claude Opus 4.7 on Anthropic's model deprecations page and it reads Active, with a tentative retirement "Not sooner than April 16, 2027." Google's deprecations page likewise lists no retirement date for its Gemini 3.x Flash models. Both makers are keeping these models. Copilot is not.

That is not a contradiction and nobody is wrong. A model has a lifetime at the company that trains it and a separate one inside every product that resells it, and the second one can be shorter. What it means in practice is that the schedule you need is the one published by the tool you actually open, not by the lab whose name is on the model. A developer who checked Anthropic's page this week would conclude, correctly, that Opus 4.7 is going nowhere — and lose it in their editor on October 2 anyway.

GitHub has already done this once this month. On September 10 it posted that it had deprecated MAI-Code-1-Flash across Copilot "today, September 10, 2026" — same-day notice, with MAI-Code-1.1-Flash as the alternative.

What to do before the date

  • API users: search your configuration for the exact strings gemini-omni-flash-preview and gpt-5.4-cyber. A pinned model id in an environment file is the kind of thing that fails at 9 a.m. on a Thursday with nobody remembering it was there.
  • Copilot users: if you picked Opus 4.7, Gemini 3.5 or 3.6 Flash, or Kimi K2.7 Code in the model menu, pick the replacement now rather than finding the choice gone mid-task.
  • Copilot Business and Enterprise admins: this is the line that matters most. GitHub's notice says: "Copilot Enterprise and Copilot Business administrators may need to enable access to the alternative models through their model policies in Copilot settings." If the replacement is not switched on in policy, your users lose the old model and do not automatically get the new one.

Also tonight

Anthropic's temporary increase to Claude Code weekly limits ends today. The terms article reads "through September 13, 2026 at 11:59 PM PT", and states that afterwards limits "return to their standard levels." As of this morning's read it had not been extended.

One more date on the same Google page, further out: its August 13 entry says Gemini 3.7 Flash is "available at an introductory price through December 31, 2026." The entry states the end of the window but not the price, and not what the price becomes afterwards.

What is not established

  • These are schedules, not events. None of these retirements has happened yet, and each vendor can move its own date. This desk has put all three on its deadlines board and will re-read each page the day after.
  • None of the notices gives a reason, and nothing here says anything about the quality of a retired model or its replacement.
  • Google's sentence was read through a rendering fetcher, because the changelog redirects a plain unauthenticated client to a sign-in page.
  • "Deprecated" is not always "removed." GitHub and Google both use the word for the date access ends in their products; OpenAI's ledger separates the two and uses "removed from the API" for October 1.

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