github-copilot

1. September 27, 2026News7 receipts4 min

   GitHub Copilot drops six models on October 19, GPT-5.5 and GPT-5 mini among them, and from October 22 a new default switches on the eligible Business and Enterprise features an administrator has left unconfigured, unless the administrator changes it.

   GitHub posted on September 18 that it will deprecate six models across all GitHub Copilot experiences on October 19, 2026: Gemini 3.7 Flash, GPT-5.5, GPT-5.4, GPT-5.4 mini, GPT-5 mini and Grok 4.5. The suggested alternatives are Gemini 3.8 Flash, GPT-5.6 Sol, GPT-5.6 Luna and Grok 4.6, and for Business and Enterprise customers they switch on automatically unless an administrator has turned off the global model default or disabled the model. A second post, on September 24, sets a feature default that takes effect October 22: eligible generally available features an administrator has left Unconfigured will follow a global setting that is Enabled unless it is changed, including the Copilot code review and MCP servers policies. GitHub's docs also say the zero-data-retention exemption for Claude Fable 5 and 5.1 runs only through the end of 2026. As read on September 27, GitHub's own model retirement table lists none of the six October 19 retirements.

   Also filed underaideprecationsdated-termsenterprise-admindata-retention

2. September 14, 2026Commentary4 receipts3 min

   The retirement that never breaks is the one to watch. The old name keeps answering — and something else is doing the answering.

   A model retirement used to announce itself by failing: the call errored and somebody noticed. This month's schedules show a quieter pattern. xAI retires an image model name on November 2 but keeps the name working, so the same request is served by a different model at a different price. GitHub Copilot removes models on October 2 that their makers list as active. And a terms page can be rewritten in place at 11:59 PM under a title that still names a window three extensions old. None of these break anything. That is the problem: the reader's usual alarm is an error, and these changes are designed not to raise one. The defence is to ask a different question — not 'does it still work?' but 'what is answering when I call this name?'

   Also filed undermethoddeprecationsaixaidated-terms

3. September 13, 2026News8 receipts5 min

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

   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. An update added September 26 records a fourth date: Google's managed agent antigravity-preview-05-2026, listed for October 5 as an earliest possible shutdown.

   Also filed underaideprecationsretirementsopenaigoogleanthropicdated-termsmanaged-agents

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