Claude Haiku 5.5
Claude Haiku 5.5 is Anthropic’s small, fast model, released on October 7, 2026 with a 1M-token context window.
- Lab
- Anthropic
- Release date
- Status
- Generally available
- API model ID
- claude-haiku-5-5
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
Anthropic launched Claude Haiku 5.5 (claude-haiku-5-5) on October 7, 2026 for high-volume, latency-sensitive tasks such as classification, extraction and routing. The Claude Platform release notes list a 1M-token context window, 128k max output tokens and adaptive thinking with the effort parameter; Anthropic says it is the first Haiku-class model with an adjustable effort setting. It is available on the Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud and Microsoft Foundry. The models overview gives a reliable knowledge cutoff of June 2026 and text and image input with text output.
Our launch report: Anthropic Claude Haiku 5.5 release on October 7, 2026.
- Modalities
- Text and image input; text output
- Knowledge cutoff
- June 2026
- Availability
- Claude API, Amazon Bedrock, Claude Platform on AWS, Google Cloud, Microsoft Foundry.
- Official source
- anthropic.com
- Last checked
Questions
When was Claude Haiku 5.5 released?
What is the Claude Haiku 5.5 context window?
What is the API model ID?
claude-haiku-5-5.Where is Claude Haiku 5.5 available?
Source
Release dates, model IDs and limits come from each lab’s own announcement, changelog, documentation or deprecations page, linked on every model with the date it was last checked. How we pick and check sources: editorial standards.