Model releasesOctober 7, 2026Impact
Claude Haiku 5.5 brings near-Sonnet quality to the fast tier
Anthropic released Claude Haiku 5.5, its small, fast model, with strong computer use and coding at a fraction of Sonnet's price.
Why it matters
Fast-tier models power most high-volume products and sub-agents. Haiku 5.5 makes capable agent workers far cheaper to run in parallel.
The details
- Haiku 5.5 leads our cost-efficiency race and places in the top ten of the agents race, ahead of several larger models.
- Anthropic positions it as the default sub-agent for Claude Code and the Agent SDK.
Models in this story
Provenance: Lab announcement; speed independently measured. Illustrative placeholder story.