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QiHang

Claude Sonnet 4.5 API

QiHang
About

Build advanced reasoning agents with Claude Sonnet 4.5, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.43/1M input and $2.14/1M output tokens, native tool calling support. Access Claude Sonnet 4.5 via the QiHang API with up to 64K output tokens.

Capabilities

Input Modalities

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Output Modalities

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Reasoning
Yes
Structured Output
No
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
$0.43
Output
$2.14
Frequently Asked Questions

Claude Sonnet 4.5 by QiHang costs $0.43 per 1M input tokens and $2.14 per 1M output tokens.

Model Details
ID
claude-sonnet-4-5-20250929
Provider
QiHang
Family
claude-sonnet
Release Date
Sep 29, 2025
Knowledge Cutoff
Jul 31, 2025
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
QIHANG_API_KEY
API Base URL
https://api.qhaigc.net/v1
Documentation