LLM Reference
OpenRouter

Using Claude Sonnet 4.5 on OpenRouter

Implementation guide · Claude 4.5 · Anthropic

Serverless

OpenRouter exposes Claude Sonnet 4.5 through model ID anthropic/claude-sonnet-4.5. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-07-26. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at OpenRouter and generate an API key.
  2. 2
    Use the OpenRouter SDK or REST API to call anthropic/claude-sonnet-4.5 — see the documentation for request format.
  3. 3
    You'll be billed $3.00/1M input, $15.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$3.00
Output tokens$15.00

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured Outputs

About Claude Sonnet 4.5

Claude Sonnet 4.5 is Anthropic's Claude 4.5 model with multimodal text and image input and an optional reasoning mode. It offers a 200K-token context window and scores 86 on MMLU PRO.

Full model details →

Model Specs

Released2025-09-29
Context200k
ArchitectureDecoder Only
Knowledge cutoff2025-12

More Models on OpenRouter

Claude Haiku 4.5Claude Opus 4.5
All models on OpenRouter →

Also available on(7)

Microsoft Foundry$3.00/1MAnthropic$3.00/1MGCP Vertex AI$3.00/1M
Compare all providers →

Provider

OpenRouter
OpenRouter

OpenRouter, Inc.

New York, NY, USA