Anthropic · Shipped
Claude Haiku 5.5 release date
Specs, benchmarks and changelog are on the Claude Haiku 5.5 model card at TPS.
Released
Oct 7, 2026
What we know
This is a newsroom index, and the excerpt gives no access terms for Haiku 5.5, so general availability is inferred from the 'Introducing' headline. The page describes it as Anthropic's fastest, most capable small model, built for summarization, subagents, and browser use.
Spec
- Params
- Not stated
- Active
- Not stated
- Context
- 1000000
- Weights
- Closed
- Modality
- Not stated
- Codename
- Not stated
Every claim
11 from 7 sources- Hacker News (AI front page)Spotted in the wildOct 7
Claude Haiku 5.5 released on Anthropic's website.
- Anthropic NewsFrom the labOct 7
Anthropic announced Claude Haiku 5.5, described as the fastest, cheapest, and most capable small model.
- OpenRouter catalogSpotted in the wildOct 7
Claude Haiku 5.5 is now available on OpenRouter with 1M token context window.
- TechmemeFrom the labOct 7
Anthropic launched Claude Haiku 5.5 with reduced pricing.
- TechmemeFrom the labOct 7
Anthropic launches Claude Haiku 5.5, a small model optimized for high-volume, cost-sensitive tasks with new effort controls.
- OpenRouter catalogSpotted in the wildOct 7
Claude Haiku 5.5 is now available on OpenRouter; succeeds Claude Haiku 4.5 with improved coding and computer use.
- The DecoderSpotted in the wildOct 7
Claude Haiku 5.5 released with 90% token price reduction and improved OSWorld benchmark performance from 15.7% to 72.4%.
- Simon WillisonFrom the labOct 7
Claude Haiku 5.5 released by Anthropic with improved performance and new pricing structure matching GPT-6 Luna.
- TestingCatalogFrom the labOct 7
Anthropic launched Claude Haiku 5.5 with lower API pricing and adjustable effort settings.
- TechmemeFrom the labSep 28
Anthropic plans to release Claude Haiku 5.5 soon but does not specify a date.
- The DecoderFrom the labSep 22
Anthropic says Haiku 5.5 is expected in the coming weeks.