Claude Opus 4.5

Claude Opus 4.5 is Anthropic's newest top-tier release in the Claude Opus family, announced on November 24, 2025, and shipped under the API identifier claude-opus-4-5-20251101 across the Claude apps, the Claude API, and the three major cloud platforms. Anthropic positions it as the best model in its lineup for coding, agents, and computer-use tasks, while also pitching meaningful improvements on everyday work like deep research, slide preparation, and spreadsheet handling. Alongside the model, Anthropic refreshed the Claude Developer Platform, Claude Code, and its consumer apps with tools aimed at longer-running agents and tighter integration in Excel, Chrome, and on desktop.

On independent evaluations, Claude Opus 4.5 is described by Anthropic as state-of-the-art on real-world software engineering tests, with the highest score shown on SWE-bench Verified among compared frontier models. A secondary write-up of the announcement also reports roughly a fifteen percent gain over Claude Sonnet 4.5 on Terminal Bench, reflecting Anthropic's broader efficiency story of fewer tokens consumed, fewer iterations needed, and support for longer workflows. Practical fit centers on heavy-duty developer and enterprise workloads, including code generation and refactoring, multi-agent orchestration, and automation across productivity tools, with Anthropic pricing the model to make Opus-class capability more broadly accessible.