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Kiro

Claude Sonnet 4.5 API

Kiro
About

Integrate multimodal vision capabilities using Claude Sonnet 4.5, designed to process both text and images seamlessly. This model delivers available completely free of charge, native tool calling support. Access Claude Sonnet 4.5 via the Kiro API with up to 64K output tokens.

Capabilities

Input Modalities

textimage

Output Modalities

text
Reasoning
No
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
Free
Output
Free
Frequently Asked Questions

Claude Sonnet 4.5 by Kiro costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
claude-sonnet-4.5
Provider
Kiro
Family
claude-sonnet
Release Date
Mar 23, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
kiro-acp-ai-provider
Environment Variables
KIRO_API_KEY
API Base URL
https://q.us-east-1.amazonaws.com
Documentation