Claude Haiku 5.5

Claude Haiku 5.5 is a new small model positioned as the cheapest, fastest, and most capable small model from Anthropic, running on average about 75% cheaper than Haiku 4.5. It reports meaningful gains across coding, desktop/computer tasks, and knowledge work, and is targeted at high-volume, cost-sensitive workloads. Typical use cases called out include repetitive tasks such as summaries and classification, live customer support and browser interactions, and serving as a low-cost subagent alongside larger models like Claude Opus 5.5 and Sonnet 5.5 for coding pipelines.

Key specifics: Haiku 5.5 introduces an adjustable effort setting to let users trade cost for higher intelligence per request, and it is optimized for operations under 100,000 tokens (about 90% of prior Haiku requests). Alignment evaluations reportedly show major improvements with far fewer misaligned behaviors. Availability spans major clouds (AWS, Google Cloud, Microsoft Azure). Complementing the release, Sonnet 5.5’s cache-read price is halved to $0.10 per million tokens, reducing typical long-running workload costs on Sonnet by roughly 20%.