Claude Opus 5.5 is Anthropic’s Claude 5.5 model for complex agentic coding, computer use, knowledge work, and business workflows. It is designed for demanding multi-step tasks with lower reported typical workload costs and faster output than Opus 5.
Claude Opus 5.5 is Anthropic’s first model in the Claude 5.5 family. It is positioned for demanding agentic coding, computer-use, knowledge-work, and business-workflow tasks where the model must reason through multiple steps rather than only generate a short response.
The model is presented as a more efficient successor to Opus 5: Anthropic reports 40% lower costs on typical workloads, lower token prices, and output generation more than 30% faster than Opus 5. It also includes expanded behavioral testing and safeguards, with additional verification requirements for some biology and cybersecurity uses.
Anthropic reports leading results for Opus 5.5 in agentic coding, computer use, and knowledge work benchmarks, with additional results for business workflows, multidisciplinary reasoning, scientific research, and visual chart recognition.
The model can support multi-step software work, including a reported 680,000-line code migration completed in less than a day by an early tester and repeated improvements to web-app load times.
Opus 5.5 is reported to generate output more than 30% faster than Opus 5. Anthropic also says it uses fewer tokens per task, contributing to lower typical workload costs.
Anthropic says the model communicates more naturally, puts important information first, and produces writing that is easier to follow and check during long sessions.
The launch includes safeguards for capable models, testing across thousands of simulated scenarios, and expanded evaluation of longer tasks, impossible tasks, and scenarios modeled on real incidents.
Vetted organizations can apply to the Life Sciences Verification Program, and Anthropic says verified cybersecurity practitioners will be able to access Opus 5.5 through its Cyber Verification Program as access expands.
Use Opus 5.5 for large codebase changes that require planning, implementation, and validation across many files, such as migrations or broad refactoring projects.
Ask the model to inspect a web application, identify performance bottlenecks, and implement targeted changes while checking that behavior remains intact.
Apply the model to extended knowledge-work assignments that require research, structured reasoning, drafting, and review rather than a single short answer.
Use computer-use and business-workflow capabilities for multi-step operational tasks, while treating benchmark results as directional and reviewing important outputs.
Vetted biology organizations and verified cybersecurity practitioners can use the model for eligible research or defensive work through Anthropic’s verification programs.
Claude Opus 5.5 is intended for complex agentic coding, computer-use tasks, knowledge work, business workflows, and some scientific research tasks. Its benchmark results and launch examples indicate that it is designed for work requiring extended reasoning and multi-step execution.
The launch page lists prices of $4 per million input tokens, $20 per million output tokens, $0.20 per million cache-read tokens, and $5 per million cache-write tokens. Anthropic says typical workloads cost 40% less than Opus 5, but actual costs depend on token usage and workload.
Anthropic reports that Opus 5.5 generates output more than 30% faster than Opus 5 and uses fewer tokens per task in its testing. Speed and cost can vary with the task, settings, and workload.
Anthropic says Opus 5.5 is available through Claude subscription plans, including Pro, Max, Team, and seat-based Enterprise plans, with increased five-hour usage limits for those plans. The supplied product material does not specify every model-access or deployment detail.
Opus 5.5 is released with safeguards and was evaluated using Anthropic’s automated behavioral audit. Anthropic reports improved resistance to prompt injection and lower likelihood of taking hard-to-reverse actions, while also stating that the model still has limits. High-risk biology and cybersecurity access is subject to verification programs.
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