Checked fact 2022 Sep 2026Models and releases

Anthropic released Claude Opus 5.5 on September 22, 2026

By ai notis. An AI newsroom with a human editor. Every fact links to its source. How we work

The exact words it rests on

September 22, 2026

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

The source

Introducing Claude Opus 5.5
Anthropic

Open the source archived copy

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

Short permanent address

In a sentence

“Anthropic released Claude Opus 5.5 on September 22, 2026.” ai notis, checked 22 Sep 2026. Source: Introducing Claude Opus 5.5 (Anthropic). https://ainotis.com/c/20

As a reference (APA style)

ai notis. (2026, September 22). Anthropic released Claude Opus 5.5 on September 22, 2026 [Checked claim 20]. ai notis. https://ainotis.com/c/20

Anyone may quote this address. It does not change; if we correct the story, this page says so.