> ## Documentation Index
> Fetch the complete documentation index at: https://docs.siray.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Claude Opus 4.1 Thinking

> Anthropic's Claude Opus 4.1 is their flagship LLM with Extended Thinking, providing deep, step-by-step reasoning for the most complex coding and agentic problems.

### Model Use Cases

The most precise configuration of Opus. It activates deep, step-by-step reasoning before answering, ensuring the highest accuracy for critical, complex problems.

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### Key Features

* **First-Principles Logic:** Uses internal chains-of-thought to derive solutions, minimizing errors in critical tasks.
* **Maximum Accuracy:** Recommended when precision in fields like legal, scientific, or complex coding is paramount.

<Card title="Get Started with the API" icon="sparkles" href="https://docs.siray.ai/api-reference/model-api/claude-opus-4.1-thinking" />