Claude Sonnet 4.5 is switched off on 30 November, and any AI visibility audit still asking it will come back a column short.

Anthropic's deprecation table lists claude-sonnet-4-5-20250929 as Deprecated since 30 September 2026, with retirement on 30 November 2026 and claude-sonnet-5-5 as the recommended replacement. The page is plain about what retirement means: "Requests to retired models fail." Anthropic says it gives at least 60 days' notice, which is the notice this is.

OpenAI's table lists gpt-5.1 and its snapshot gpt-5.1-2025-11-13 for shutdown on 1 April 2027, announced 1 October 2026, with gpt-6-sol as the replacement. Google's Gemini table lists gemini-3.5-flash with no shutdown date: the endpoint stays up but already routes requests to gemini-3.6-flash.

None of this is news to developers who read the deprecation pages. It matters to anyone measuring AI answers through the APIs, because the model answering a "Claude" or "Gemini" question can change, or stop answering, on a date set by the vendor.

A LinkedIn post quoted an unnamed Googler at a Search Central Live event saying clicks and queries are the most requested data for Search Console's AI performance report. Gary Illyes replied: "I don't think we've phrased it like this." He added that the team is "super interested in giving more data, data that makes sense, but we don't have anything to announce yet." Schwartz reads that as clicks not coming. That is his reading, not a Google statement.

For context, the June report on the same tool described it as showing impressions, pages, countries, devices and dates, with no clicks, and as rolling out first to a small group of UK site owners with data from 18 May 2026.