Technical Specifications

Claude 4.1 Opus Thinking

Claude 4.1 Opus Thinking is a high-capacity large language model designed for advanced reasoning, software engineering, and complex autonomous task execution. As the flagship variant within the Claude 4 family, it utilizes a hybrid reasoning architecture that allows the model to alternate between standard low-latency responses and an extended thinking mode. This thinking process enables the model to perform multi-step planning and deep analytical verification before generating final outputs, making it particularly effective for long-horizon projects that require sustained attention to detail.

The model's architecture is optimized for dense computational performance with a primary focus on text and vision modalities. It features a significant 200,000-token context window, allowing for the ingestion and synthesis of extensive codebases, legal documents, and technical manuals. A distinguishing characteristic of this variant is its extended thinking capability, which provides a dedicated computational budget of up to 64,000 tokens for internal reasoning chains. This internal state is summarized for efficiency, ensuring that complex logical derivations remain coherent over thousands of execution steps.

Technically, Claude 4.1 Opus Thinking is engineered to function as a sophisticated agentic partner, capable of integrating with external tools such as bash environments and file editors through a standardized interface. It demonstrates a refined ability to perform multi-file code refactoring and precise debugging without the need for constant human re-prompting. By leveraging absolute position embeddings and a multi-head attention structure, the model maintains high precision across its expansive context, making it suitable for enterprise-level automation and research applications that demand rigorous adherence to complex instructions.