Expert-level for deep writing and complex reasoning
Claude 4 Opus is a flagship model known for high-quality outputs and stronger reasoning. Rather than optimizing for maximum speed, it focuses on completeness, logical consistency, and writing quality. It performs reliably in creative writing, complex instruction following, long-context understanding, and deep analysis—ideal for professional tasks where output quality matters most.
More rigorous logic for demanding workflows
For demanding tasks like research analysis, strategy planning, and system architecture design, it excels at breaking down problems while keeping reasoning coherent end-to-end. When prompts are ambiguous or constraints are complex, it produces more actionable plans and clearer justification—reducing logical leaps and inconsistencies.
Handles long context well, natural writing
It handles long-form content exceptionally well—analyzing lengthy reports, legal documents, or technical materials in one go and extracting key points clearly. For writing, it produces more natural language and clearer structure, adapts tone and organization to your instructions, and reduces back-and-forth editing.
Its strengths include stronger understanding and reasoning, along with higher-quality, more natural writing. It’s more reliable on complex tasks with implicit requirements and multiple constraints, and it’s well suited for high-quality writing and rigorously structured analysis.
Best for tasks where quality and rigor matter—long-form writing and refinement, research and analysis reports, complex planning, and careful argumentation. For casual chat or maximum speed, a lighter model may fit better; for high-quality deliverables, it’s a reliable choice.
Yes—very well. You can provide lengthy content and ask it for summaries, comparisons, structured extraction, and key takeaways to quickly capture what matters.
The model includes knowledge up to a certain cutoff date, which is sufficient for most general questions. If you need the latest real-time information (such as news, market data, or newly published technical materials), enable "Always Search." Once enabled, it will retrieve information from the internet to provide more up-to-date references and answers.
Yes. We provide a free quota so you can try Claude 4 Opus. For higher limits or more frequent use, you can upgrade to a subscription plan—see the pricing page for plan benefits and quotas.
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