# Anthropic releases Claude Haiku 5.5, its smallest and lowest-cost model

Canonical page: https://technooptimist.io/stories/anthropic-releases-claude-haiku-5-5-its-smallest-and-lowest-cost-model-67bb33f4
Date: 7 Oct 2026
About: [Anthropic](https://technooptimist.io/companies/anthropic.md) · [Claude models](https://technooptimist.io/ai/claude.md)
Original source: https://9to5mac.com/2026/10/07/anthropic-upgrades-claude-with-new-haiku-5-5-model-details-here/

Anthropic released Claude Haiku 5.5 on 7 October 2026. Anthropic describes it as the smallest and lowest-cost model it has released, built for high-volume work where cost matters. It follows Sonnet 5.5 and Opus 5.5 in the 5.5 family.

## Key facts

- Released 7 October 2026, as the smallest model in the Claude 5.5 family
- Built for high-volume work where cost matters most
- Anthropic's own announcement is the primary source; this summary takes only the release date and positioning from the report

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