Claude Opus 5.5 is an AI model from Anthropic for coding, AI agents and professional knowledge work. The page describes it as a hybrid reasoning model with a 1M context window and as the strongest model in the Opus tier so far.
For software teams, it is positioned for long-running work in large codebases, including building features, debugging, refactoring and code review. It is also aimed at agents that orchestrate multi-tool tasks, coordinate subagents and keep working with minimal oversight. Other use cases on the page include financial analysis, reading documents and charts, and computer use across several applications.
Developers can call it through the Claude API using the model name claude-opus-5-5. The page says it is also available on Amazon Web Services, Google Cloud and Microsoft Foundry. Business and consumer users can access it through Claude Pro, Max, Ultra, Team and Enterprise plans. Fast mode is offered in Claude Code and on the Claude Platform at up to 2.5x the speed.
On the API, the page lists $4 per million input tokens and $20 per million output tokens, with cache reads at $0.20 per million tokens. Fast mode costs $8 per million input tokens and $40 per million output tokens. US-only inference is priced at 1.1 times the standard rate for input and output tokens.
