Claude Opus 4.5 (latest)

Claude Opus 4.5 sits at the top of Anthropic's Claude 4.5 family as the option aimed at the hardest reasoning, coding, and long-horizon agent tasks. A third-party model directory describes it explicitly as a "flagship Claude model for deep reasoning, coding, and long-horizon agents," positioning it above the more balanced and efficiency-focused siblings in the same generation. That role framing is the clearest piece of variant-specific evidence available, since the broader Claude 4.5 coverage in other supplied sources focuses on Sonnet 4.5 and Haiku 4.5 rather than Opus itself. For teams choosing a model for production work, the practical takeaway is that Opus 4.5 is the variant to reach for when a workload needs sustained, multi-step problem solving rather than high-throughput or low-latency serving.

In day-to-day use, Claude Opus 4.5 accepts text, image, and PDF inputs and produces text output, which makes it flexible for grounded reasoning over mixed documents and screenshots without requiring a separate vision pipeline. the cataloged API limit context window with up to the cataloged API limit tokens of output gives it room to hold long agent traces, large codebases, or extended retrieved-document sets while still leaving space for substantive responses. The token economics shown in the directory sit at the high end of the Claude 4.5 range, reflecting its frontier positioning rather than commodity serving. The combination of multimodal input, generous context, and a focus on extended agent-style workflows suggests the best fit is complex autonomous tasks where reliability on multi-step reasoning matters more than per-token cost.