Claude Haiku 5.5

Claude Haiku 5.5 is Anthropic's fastest and most capable small model, designed for high-volume, cost-sensitive tasks such as summaries, classification, coding assistance, and live customer support. It delivers major gains over Haiku 4.5 while costing around 75% less to run.

Reasoning
Vision
Native PDF input
Tool Calling
Structured Output

Added Oct 7, 2026

Pricing

Auto routing · per 1M tokens

Input: $0.10
Output: $0.50
Cache read: $0.0100

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Specifications

Context window: 1M
Max output: 128K
Avg output (7d): 1.8K tokens; Longer than 90% of models

Benchmarks

Artificial Analysis

Design Arena

Sourced from Artificial Analysis.

Intelligence Index

43.4

Better than 94% of models compared

Agentic work

GDPval-AA (unversioned / legacy)

Legacy fallback · Economically valuable tasks

55.9%

Document reasoning

AA-LCR (unversioned / legacy)

Legacy fallback · Long context reasoning evaluation

82.7%

Better than 94% of models compared

Reasoning

HLE

Humanity's Last Exam

44.4%

Better than 92% of models compared

CritPt

Research-level physics reasoning

18.9%

Coding

SciCode

Python programming for scientific computing

55.0%

Better than 77% of models compared

Knowledge

AA-Omniscience Accuracy

Proportion of correctly answered questions

36.4%

AA-Omniscience Hallucination Rate

Rate of incorrect answers among non-correct responses

40.4%

Last updated Oct 14, 2026