Claude 4.1 Opus
Parameters
-
Context Length
200K
Modality
Text
Architecture
Dense
License
Proprietary
Release Date
5 Aug 2025
Knowledge Cutoff
Mar 2025
Evaluation Benchmarks
Rank
#42
| Benchmark | Score | Rank |
|---|---|---|
Coding | 0.71 | 10 |
Professional Knowledge | 0.87 | 10 |
Graduate-Level QA | 0.809 | 25 |
Web Development | 1389 | 40 |
General Text | 1447 | 41 |
Rankings
Overall Rank
#42
Coding Rank
#20
About Claude 4.1 Opus
Claude 4.1 Opus is a flagship dense transformer model within Anthropic's fourth-generation family, specifically engineered as a high-precision successor to the Opus 4 architecture. It is designed for enterprise-grade applications requiring sophisticated cognitive reasoning, autonomous agentic behavior, and meticulous code manipulation. The model is optimized for long-horizon tasks where the integrity of multi-step instructions and the ability to navigate vast, interconnected data structures are more critical than generation throughput.
The model's architecture implements a dense transformer framework utilizing Multi-Head Attention (MHA) and absolute position embeddings to ensure semantic consistency across its 200,000-token context window. A primary technical innovation is its hybrid reasoning system, which incorporates an extended thinking mode. This feature allows the model to allocate an internal reasoning chain of up to 64,000 tokens to decompose complex problems, such as multi-file architectural refactoring or deep analytical research, before producing a finalized output. This separation of exploratory logic from the terminal response significantly reduces logical drift in production environments.
Functionally, Claude 4.1 Opus is tailored for integration into agentic workflows, demonstrating high proficiency in tool-assisted operations and surgical code corrections within large-scale software repositories. It is a multimodal system capable of processing interleaved text and image inputs, facilitating the analysis of technical schematics, financial documentation, and complex visual data. The model operates under Anthropic's AI Safety Level 3 (ASL-3) framework, featuring robust resistance to prompt injection and maintaining a high precision rate for refusals of harmful content while minimizing over-refusal on benign technical queries.
Technical Specifications
Detailed architecture specifications are limited for proprietary models.
Resources
About Claude 4
Anthropic's fourth generation Claude models with advanced reasoning, extended context windows up to 200K tokens, and configurable thinking effort levels. Features improved safety alignment, nuanced understanding, and sophisticated task completion. Includes Opus (most capable), Sonnet (balanced), and Haiku (fast) variants, with thinking modes that enable transparent chain-of-thought reasoning for complex problems.