Using Claude Sonnet 5.5 on OpenRouter

Implementation guide · Claude 5.5 · Anthropic

Serverless

OpenRouter exposes Claude Sonnet 5.5 through model ID anthropic/claude-sonnet-5.5. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-10-07. 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-5.5 — see the documentation for request format.
  3. 3
    You'll be billed $2.00/1M input, $10.00/1M output tokens. See full pricing.
API PortalDocumentationPricingModel Card

Code Examples

See OpenRouter documentation for integration details.

Pricing on OpenRouter

TypePrice (per 1M)
Input tokens$2.00
Output tokens$10.00

Capabilities

VisionMultimodalReasoningJSON / Tool useStructured OutputsPrompt CachingBatch API

About Claude Sonnet 5.5

Anthropic's Claude Sonnet 5.5, second model in the Claude 5.5 family, released September 28, 2026. First-party positioning: faster, lower-cost complement to Claude Opus 5.5; strongest at well-scoped everyday tasks, bug fixes, and polished documents/slides/spreadsheets; clear upgrade over Claude Sonnet 5 (30%+ faster output; up to 30% less cost per task via fewer tokens — list price unchanged vs Sonnet 5). Claude API id claude-sonnet-5-5. List price $2 per 1M input and $10 per 1M output; cache reads $0.10 / MTok; 5m cache writes $2.50; 1h cache writes $4; Batch API 50% off ($1/$5).

Full model details →

Model Specs

Released2026-09-28
Context1M
ArchitectureDecoder Only
Knowledge cutoff2026-06

More Models on OpenRouter

Claude Haiku 5.5Claude Opus 5.5
All models on OpenRouter →

Also available on(4)

Anthropic$2.00/1MAWS Bedrock$2.00/1MGCP Vertex AI$2.00/1M
Compare all providers →

Provider

OpenRouter

OpenRouter, Inc.

New York, NY, USA