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Claude Haiku 5.5 adds adaptive thinking and scores 43 on the Intelligence Index

latent.space 7 min read Editor score 6/10

The roundup reports a 26-point year-over-year gain on Artificial Analysis’s Intelligence Index and says Haiku 5.5 adds effort settings and adaptive thinking. These are useful signals for teams weighing smaller models for production workloads.

What

Claude Haiku 5.5 is Anthropic’s small model, available on the Claude Platform and in Claude Code for high-volume, cost-sensitive tasks.

How

It is the first Haiku model with effort settings and adaptive thinking; Anthropic says it costs about 75% less to run than Haiku 4.5 on average.

Why it matters

Anthropic positions it as a subagent alongside Opus 5.5 or Sonnet 5.5 for work such as summaries, compactions, and database queries.

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