Activefastllm Proprietary

Claude Haiku 4.5

by Anthropic· Released March 2025· Cutoff January 2025

Claude Haiku 4.5 is Anthropic's fastest and most cost-effective model, designed for high-throughput, low-latency applications. It offers a balance of speed and intelligence, making it ideal for real-time tasks like customer support and content moderation. As the latest iteration in the Haiku family, it provides improved performance over its predecessor while maintaining competitive pricing.

Official Site API Docs

Input cost

$0.80 per 1M tokens

Output cost

$4.00 per 1M tokens

Context window

200K tokens

Max output

8192 tokens

Modalities

textimage

License

proprietary

Capabilities

Function CallingVisionCode GenerationStreamingJSON ModeMultilingual SupportTool Use

Best For

High-speed, cost-sensitive applications requiring low latency and reliable performance.

Strengths

Fastest inference speed among Claude models
Lowest cost per token in the Claude lineup
Strong performance on coding and structured outputs
Supports vision and function calling

Limitations

Less capable on complex reasoning compared to Claude Sonnet and Opus
Smaller context window than Claude Sonnet (200K vs 200K, same but not larger)
May struggle with nuanced creative tasks
Not suitable for very long-form content generation

Use Cases

Real-time customer support chatbots

Content moderation and filtering

Code completion and debugging

Data extraction and classification

Simple question-answering systems

Language translation

Lightweight agentic workflows

Improvements Over Previous Model

Improved coding benchmark scores (e.g., HumanEval+ 90.2% vs 88.9% in Haiku 3.5)
Enhanced instruction following and reduced refusal rates
Better multilingual performance across 100+ languages
Lower latency: ~30% faster than Claude Haiku 3.5
Improved vision capabilities with higher accuracy on visual QA

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