Claude Opus 5.5 is available on OpenRouter

Claude Opus 5.5 from AnthropicAI is available on OpenRouter. OpenRouter describes it as the first model in the Claude 5.5 family, with a 1 million-token context window, priced at $4 per million input tokens and $20 per million output tokens.

OpenRouter says the price is 20% lower per token than Opus 5, and that the model leads Opus 5 and Fable 5.1 on agentic coding, knowledge work, and computer use.