# Claude Haiku 5.5

Anthropic, released 2026-10-07

**Verdict: conditional.** Claude Haiku 5.5 is a conditional pick: Anthropic's fastest and cheapest current Claude at $0.10 input and $0.50 output per 1M tokens, with a 1M context and adjustable effort. Prompts over 100K tokens cost five times as much, and every benchmark is Anthropic's own. Right for high-volume classification, extraction, routing and subagent work. Use Sonnet 5.5 for complex agentic coding, where Anthropic's own Terminal-Bench 4.0 numbers put it well ahead. Last verified 2026-10-09.

## Pricing

- Input: $0.10 / 1M tokens
- Output: $0.50 / 1M tokens
- Context: 1M ctx; prompts over 100K cost $0.50/$2.50

## Strengths

- High-volume, latency-sensitive work such as classification, extraction, routing and subagent tasks, which is the use Anthropic names for it
- Cost at scale: $0.10 input and $0.50 output per 1M tokens up to 100K-token prompts, cache reads $0.01, Batch API at 50% off
- Long inputs: 1M-token context and 128K output, with 300K output on the Batches API behind a beta header
- Multi-cloud buyers: the Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry and Claude Platform on AWS all offer Haiku 5.5
- Cost-sensitive prompts over 100K tokens: input rises to $0.50 and output to $2.50 per 1M, five times Haiku 5.5's own base rate, and cache reads count toward the threshold
- Complex agentic coding: Anthropic's own table has Haiku 5.5 at 39.2% on Terminal-Bench 4.0 against Sonnet 5.5 at 70.6%
- Code that sets temperature, top_p or top_k: any non-default value returns a 400 error
- Penetration testing: Anthropic says the safeguards still block it
- Decisions that need independently reproduced scores: every published number is Anthropic's

## Benchmarks

- GDPval-AA v2.1 (Anthropic-reported): 1620 (https://www.anthropic.com/claude-haiku-5-5)
- OSWorld 2.1, offline subset (Anthropic-reported): 72.4% (https://www.anthropic.com/claude-haiku-5-5)
- Humanity's Last Exam, with tools (Anthropic-reported): 57.4% (https://www.anthropic.com/claude-haiku-5-5)
- Terminal-Bench 4.0 (Anthropic-reported): 39.2% (https://www.anthropic.com/claude-haiku-5-5)
- FrontierCode 1.1 (Anthropic-reported): 46.4% (https://www.anthropic.com/claude-haiku-5-5)

## Sources

- [Claude API docs: Pricing](https://platform.claude.com/docs/en/about-claude/pricing)
- [Claude API docs: Claude Haiku 5.5 model page](https://platform.claude.com/docs/en/models/haiku-5-5/overview)
- [Claude API docs: Models overview](https://platform.claude.com/docs/en/about-claude/models/overview)
- [Anthropic: Introducing Claude Haiku 5.5](https://www.anthropic.com/claude-haiku-5-5)

Canonical: https://neomanex.com/models/claude-haiku-5-5