Claude Opus 5.5 comes to Microsoft Foundry for long-running coding and knowledge work

AI models are increasingly taking on work that extends far beyond a single prompt: building a feature across a codebase, investigating a complex issue, synthesizing hundreds of pages of information, or working through a multi-step business process.

As that work gets longer, raw intelligence is only part of what matters. The model also needs to stay focused, make good decisions along the way, communicate what it is doing, and produce work that people can quickly review and use. Today, Claude Opus 5.5 is available in Microsoft Foundry, bringing Anthropic’s most capable Opus model to developers and enterprises building AI applications and agents.

Claude Opus 5.5 is designed for everyday complex work. It advances Opus 5 across agentic coding, knowledge work, and long-running tasks while making it easier for people to understand what the model did, what it found, and what it needs next. Claude Opus 5.5 also does more with fewer tokens. Lower per-token prices and much cheaper cache reads stack on top of the efficiency gains.

Writing a function is one thing. Building a feature that touches multiple services, tracing a production issue across a large repository, or carrying a task from investigation through implementation and validation is something else entirely. Claude Opus 5.5 is designed for these longer-running workflows.

For software development, it can work through long-running coding tasks such as building features across a codebase, debugging, refactoring, and reviewing code. It finds the root cause before changing anything, checks its work as it goes, and explains its changes in plain language, so engineers can review and trust them quickly.

That combination becomes particularly valuable when developers use models through agentic coding environments, where a session may involve dozens of steps and run for an extended period of time. The same applies beyond software development.