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Anthropic ↗Released October 1, 2025

Claude Haiku 4.5

#15 Arena RankUndisclosed parameters

Claude Haiku 4.5 holds a solid spot in the Arena rankings at #15. Context window: 0.2K tokens.

Context

200K

Input

$1.00

Key Specifications

🏆

Arena Rank

#15

📐

Context Window

200K

📥

Input Price

per 1M tokens

$1.00

📤

Output Price

per 1M tokens

$5.00

🧠

Parameters

Undisclosed

🔒

Open Source

No

Best For

Fast responsesclassificationextraction

About Claude Haiku 4.5

Claude Haiku 4.5 is Anthropic's fastest and most affordable model in the Claude family, designed for high-throughput applications where speed and cost-efficiency are paramount. Despite being the lightest model in the lineup, it delivers surprisingly strong performance on classification, extraction, summarization, and simple reasoning tasks. With a 200K context window and pricing at just $1.00 per million input tokens, it's ideal for processing large volumes of data quickly — from customer support triage to content moderation to data extraction. Haiku 4.5 responds in milliseconds, making it suitable for real-time applications where users expect instant responses. It's the go-to choice for builders who need Claude's safety and quality characteristics at scale.

Built byAnthropic↗

Pricing per 1M tokens

Input Tokens

$1.00

Output Tokens

$5.00

Compare Claude Haiku 4.5

See how Claude Haiku 4.5 stacks up against other leading AI models

Claude Haiku 4.5 vs Claude Opus 4Compare →Claude Haiku 4.5 vs Claude Sonnet 4Compare →Claude Haiku 4.5 vs Claude 3 OpusCompare →Claude Haiku 4.5 vs Claude 3.5 SonnetCompare →Claude Haiku 4.5 vs Claude 3.5 HaikuCompare →

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Explore More

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Frequently Asked Questions

What is Claude Haiku 4.5?▾
Claude Haiku 4.5 is Anthropic's fastest and most affordable model in the Claude family, designed for high-throughput applications where speed and cost-efficiency are paramount. Despite being the lightest model in the lineup, it delivers surprisingly strong performance on classification, extraction, summarization, and simple reasoning tasks. With a 200K context window and pricing at just $1.00 per million input tokens, it's ideal for processing large volumes of data quickly — from customer support triage to content moderation to data extraction. Haiku 4.5 responds in milliseconds, making it suitable for real-time applications where users expect instant responses. It's the go-to choice for builders who need Claude's safety and quality characteristics at scale.
How much does Claude Haiku 4.5 cost?▾
Input pricing for Claude Haiku 4.5 is $1.00 per million tokens; output runs $5.00. Token-based pricing means you can scale up or down without a fixed commitment.
What is Claude Haiku 4.5's context window?▾
The context window for Claude Haiku 4.5 is 200K tokens. That's the maximum amount of text you can feed into a single prompt, including system instructions, conversation history, and the actual query.
Is Claude Haiku 4.5 open source?▾
Claude Haiku 4.5 is closed-source and accessible only via Anthropic's API. Proprietary models trade deployment flexibility for convenience — Anthropic handles the infrastructure.
What is Claude Haiku 4.5 best for?▾
The sweet spot for Claude Haiku 4.5 is: Fast responses, classification, extraction. If your workload fits one of these categories, it's worth benchmarking against alternatives.