Anthropic launches Claude Haiku 5.5 with 90% lower short-prompt API pricing, adjustable effort and stronger subagent use

What changed

Anthropic released Claude Haiku 5.5 on October 7 for high-volume, cost-sensitive work and subagent tasks alongside larger Claude models. Prompts up to 100K tokens are priced at $0.10 per million input tokens and $0.50 per million output tokens; longer prompts cost $0.50 and $2.50 respectively. Anthropic estimates about 75% lower average workload cost than Haiku 4.5 and adds adjustable effort to the Haiku class for the first time. Haiku 5.5 is available on the Claude Platform, AWS, Google Cloud and Microsoft Azure under model ID claude-haiku-5-5. The same launch halves Sonnet 5.5 cache-read pricing.