Claude Opus 4.5
Overview
Claude Opus 4.5 is Anthropic's flagship AI model, released on November 24, 2025. It is a hybrid reasoning large language model designed to excel in coding tasks and autonomous agent operations. The model introduces an 'effort' parameter, allowing users to adjust the balance between output quality, runtime, and cost. This feature enables Claude Opus 4.5 to perform complex, multi-step tasks with enhanced efficiency. In terms of performance, Claude Opus 4.5 achieved an 80.9% score on the SWE-Bench Verified test, surpassing competitors such as GPT-5.1 Codex Max (77.9%) and Google's Gemini 3 Pro (76.2%). This benchmark underscores its advanced capabilities in coding and agentic tasks. Additionally, the model demonstrates improved robustness against prompt injection attacks, enhancing its reliability in various applications. Intended for tasks requiring deep reasoning and complex problem-solving, Claude Opus 4.5 is particularly effective in coding, document creation, and enterprise workflows. Its advanced context management and memory capabilities make it suitable for agentic tasks, where it can autonomously manage multi-step workflows. The model's strengths include coding, long context handling, reasoning, and math.