Claude Opus 4.8 is Anthropic's flagship model in the Opus line, designed for tasks where quality and consistency matter more than speed. It delivers stronger performance on coding benchmarks, handles long-running agentic pipelines without losing coherence, and produces more reliable results on complex professional work such as research synthesis, legal review, and technical writing. The upgrade targets the failure modes of earlier Opus models — context drift over long sessions and inconsistent reasoning on multi-step tasks — making it a practical choice for automated workflows and high-stakes single-session work alike. Available via the Anthropic API and Claude.ai.