Release dates
— Anthropic launched Claude Haiku 5.5 with model ID `claude-haiku-5-5`; it accepts text and image input, returns text, and supports a 1M context window and 128K output. ↗
Claude Haiku 5.5
A lightweight model for high-volume classification, routing, extraction, and subagent tasks, with adaptive thinking, a 1M context window, and 128K output.
Launched by Anthropic on 2026-10-07 with API model ID `claude-haiku-5-5`, now available on the Claude API, Amazon Bedrock, Google Cloud, Microsoft Azure, and other listed platforms.
MODEL NUMBER085
- First public date
- 2026-10-07
- Organization
- Anthropic
- Family
- Claude
01
Specifications
Only published specifications are shown.
02
Overview
Why it mattered
Haiku 5.5 advances Anthropic’s smaller Claude tier to a 1M context window and adaptive thinking. Its distinct API ID and documented specifications mark a significant new Haiku release.
PreviousClaude Haiku 4.5— · 200K ctx
CurrentClaude Haiku 5.5— · 1M ctx
04
Architecture & capabilities
Model capabilities
Adaptive reasoningCoding
Connected tools
Computer use
Product features
Subagent
05
Release history
Anthropic launched Claude Haiku 5.5 with model ID `claude-haiku-5-5`; it accepts text and image input, returns text, and supports a 1M context window and 128K output.
View source06
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07
Sources
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