TL;DR
On October 7, 2026, Anthropic launched Claude Haiku 5.5, which the company calls its fastest, cheapest and most capable small model, with average running costs about 75% lower than Claude Haiku 4.5, designed for high-volume, cost-sensitive work.
Event overview
On October 7, 2026 (local time), Anthropic launched Claude Haiku 5.5. Per Anthropic's official newsroom, it is the company's fastest, cheapest and most capable small model yet, designed for high-volume, cost-sensitive work. Per Zhidongxi and The Paper, its average running cost is about 75% lower than the previous generation Claude Haiku 4.5.
Key facts
- Official launch: October 7, 2026, by Anthropic (per Anthropic Newsroom and its official System Card).
- Positioning: the fastest, cheapest and most capable small model, for high-volume and cost-sensitive workloads (per Anthropic's official newsroom).
- Cost cut: average running costs about 75% below Claude Haiku 4.5; pricing for prompts under 100K tokens matches GPT-6 Luna (per Zhidongxi and ai0.news).
- Capability gains: notable improvements over Haiku 4.5 on knowledge work, computer use and agentic coding benchmarks; in some areas it rivals or exceeds Claude Sonnet 5.5 (per the official System Card).
- New features: first adjustable effort levels (Low through Max) in the Haiku line; a 50% cut to Sonnet 5.5 cache reads was also included (per ai0.news).
- Use cases: summarization, data extraction, database queries and classification, i.e. fast and repetitive workloads (per Anthropic's official blog, via Zhidongxi).
Official sources
- Anthropic Newsroom (October 7, 2026): Introducing Claude Haiku 5.5
- Anthropic official System Card (October 7, 2026): System Card: Claude Haiku 5.5
- Zhidongxi (October 8, 2026): Claude's strongest mini model arrives, price slashed up to 90%
- The Paper (October 8, 2026): Average running costs down 75%; Anthropic refreshes its lightweight model