Checked fact 2222 Sep 2026Models and releases

Claude Opus 5.5 has a 1M token context window

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The exact words it rests on

Context window: 1M tokens

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

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

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

Short permanent address

In a sentence

“Claude Opus 5.5 has a 1M token context window.” ai notis, checked 22 Sep 2026. https://ainotis.com/c/22

As a reference (APA style)

ai notis. (2026, September 22). Claude Opus 5.5 has a 1M token context window [Checked claim 22]. ai notis. https://ainotis.com/c/22

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