Last refreshed 2026-05-19. Next refresh: weekly.
Why use Claude Sonnet 4.5 on OpenRouter?
OpenRouter offers Claude Sonnet 4.5 with pay-as-you-go pricing at $3.00/1M input tokens. OpenRouter is a multi-provider LLM aggregator offering unified API access to 300+ models from all major labs and emerging providers, with automatic failover for reliability.
Compare Claude Sonnet 4.5 across 8 providers to find the best fit for your use caseSetup recipe
Docs fallbackUse the provider REST API or SDKCreate a provider API keymodel: anthropic/claude-sonnet-4.5anthropic/claude-sonnet-4.5Request example
anthropic/claude-sonnet-4.5.Gotchas
- Use provider model ID "anthropic/claude-sonnet-4.5", not the LLMReference slug "claude-sonnet-4-5".
Compare Claude Sonnet 4.5 Across Providers
| Provider | Input (per 1M) | Output (per 1M) |
|---|---|---|
| Microsoft Foundry | $3.00 | $15.00 |
| Anthropic | $3.00 | $15.00 |
| Snowflake Cortex | — | — |
| GCP Vertex AI | $3.00 | $15.00 |
| AWS Bedrock | $9.00 | $45.00 |
Pricing
| Type | Price (per 1M) |
|---|---|
| Input tokens | $3.00 |
| Output tokens | $15.00 |
Capabilities
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.
FAQ
What does Claude Sonnet 4.5 cost on OpenRouter?
On OpenRouter, Claude Sonnet 4.5 costs $3 per 1M input tokens and $15 per 1M output tokens.
What is the context window for Claude Sonnet 4.5 on OpenRouter?
Claude Sonnet 4.5 supports a 1m token context window on OpenRouter.
How does OpenRouter compare to other Claude Sonnet 4.5 providers?
Claude Sonnet 4.5 is available from 8 providers. The cheapest input pricing is $3/1M tokens from Microsoft Foundry.
What API model ID do I use for Claude Sonnet 4.5 on OpenRouter?
Use the model ID anthropic/claude-sonnet-4.5 when calling OpenRouter's API.
Who created Claude Sonnet 4.5?
Claude Sonnet 4.5 was created by Anthropic as part of the Claude 4.5 model family.
Is Claude Sonnet 4.5 open source?
Claude Sonnet 4.5's open source status is unknown in the seed data.