Claude Sonnet 4.5 API
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
textimagepdf
Output Modalities
text
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
QiHangFamily
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