Checked fact 2822 Sep 2026Models and releases

The Claude Opus 5.5 model page lists its retirement as not sooner than September 22, 2027

Toned down to what the source says

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The exact words it rests on

Not sooner than September 22, 2027

What the source said when we opened it, on 22 Sep 2026.

The source

https://platform.claude.com/docs/en/models/opus-5-5/overview

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Checked

Checked by the notis newsroom on 22 Sep 2026, against the source above.

In the story

Anthropic released Claude Opus 5.5 with a 1M-token context window 22 Sep 2026

Cite this fact

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In a sentence

“The Claude Opus 5.5 model page lists its retirement as not sooner than September 22, 2027.” ai notis, checked 22 Sep 2026. https://ainotis.com/c/28

As a reference (APA style)

ai notis. (2026, September 22). The Claude Opus 5.5 model page lists its retirement as not sooner than September 22, 2027 [Checked claim 28]. ai notis. https://ainotis.com/c/28

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