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OpenRouter

Claude Haiku 4.5 API

OpenRouter
About

Build advanced reasoning agents with Claude Haiku 4.5, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $1.00/1M input and $5.00/1M output tokens, native tool calling support. Access Claude Haiku 4.5 via the OpenRouter API with up to 64K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Temperature
Adjustable
Attachment
Supported
Limits
Context Window
200K

Tokens

Input Limit
200K

Tokens

Max Output
64K

Tokens

Pricing

Standard (per 1M tokens)

Input
$1.00
Output
$5.00

Caching (per 1M tokens)

Read
$0.10
Write
$1.25
Frequently Asked Questions

Claude Haiku 4.5 by OpenRouter costs $1.00 per 1M input tokens and $5.00 per 1M output tokens. Cached reads cost $0.10 per 1M tokens. Cache writes cost $1.25 per 1M tokens.

Model Details
ID
anthropic/claude-haiku-4.5
Provider
OpenRouter
Family
claude-haiku
Release Date
Oct 15, 2025
Knowledge Cutoff
Feb 28, 2025
API Integration
NPM Package
@openrouter/ai-sdk-provider
Environment Variables
OPENROUTER_API_KEY
API Base URL
https://openrouter.ai/api/v1
Documentation