Anthropic dropped Haiku 5.5

costs 90% less than Haiku 4.5 on prompts up to 100K tokens.

Haiku 5.5 adds the first Haiku effort setting, trading cost for accuracy, but Anthropic still recommends Sonnet 5.5 and Opus 5.5 for complex agentic coding such as Terminal-Bench 4.0 tasks.

Asana reported over 30% lower task-completion latency and up to 2.5x faster inference per agent turn than its current model.

On OSWorld 2.1, which tests whether an AI agent can operate a real computer to finish long multi-step tasks, Haiku 5.5 jumped from Haiku 4.5's 15.7% to 72.4%.

On Chartography, a visual reasoning test of reading and interpreting charts without tools, it rose from 6.4% to 46.4%.