Checked fact 7408 Oct 2026Models and releases

Anthropic documentation gives Haiku 5.5 a 1M token context window and up to 128k output tokens. Quote: "a 1M token context window, and up to 128k output tokens"

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

It supports adaptive thinking with the effort parameter, a 1M token context window, and up to 128k output tokens.

What the source said when we opened it, on 8 Oct 2026.

The source

Claude Haiku 5.5 overview
Anthropic

Open the source archived copy

Checked

Checked by the notis newsroom on 8 Oct 2026, against the source above.

The number in it

1,000,000 tokens · Claude Haiku 5.5, context window (context window)

In the story

Anthropic cuts small-model prices with Claude Haiku 5.5 8 Oct 2026

Cite this fact

Short permanent address

In a sentence

“Anthropic documentation gives Haiku 5.5 a 1M token context window and up to 128k output tokens. Quote: "a 1M token context window, and up to 128k output tokens".” ai notis, checked 8 Oct 2026. Source: Claude Haiku 5.5 overview (Anthropic). https://ainotis.com/c/740

As a reference (APA style)

ai notis. (2026, October 8). Anthropic documentation gives Haiku 5.5 a 1M token context window and up to 128k output tokens. Quote: "a 1M token context window, and up to 128k output tokens" [Checked claim 740]. ai notis. https://ainotis.com/c/740

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