Claude Opus 4.1 (latest)

Claude Opus 4.1 is positioned as Anthropic's flagship offering within the Claude Opus family, designed for deep reasoning, complex coding tasks, and long-horizon agent workflows. The model accepts text, image, and PDF inputs while producing text outputs, and supports attachments, reasoning, tool calling, and temperature control for flexible deployment across diverse use cases. It is not an open-weights release, which aligns with its closed frontier-model positioning within Anthropic's catalog.

In independent preference benchmarks tracked through the Design Arena suite, Claude Opus 4.1 consistently scores in the 1186–1202 range across categories including 3D design, ASCII art, code categories, data visualization, game development, SVG, UI components, and website generation, indicating broadly competitive human-rated output quality across creative and technical design tasks. Combined with its substantial context window and large maximum generation limit, this benchmark profile suggests the model is well suited for production assistants that must synthesize long documents, reason across extended codebases, and operate as autonomous agents handling multi-step problems.