claude-opus-4-6

Claude Opus 4.6 is Anthropic’s flagship large language model, positioned as the “most powerful reasoning and coding engine for knowledge work and agent tasks,” achieving industry-leading breakthroughs in long-context understanding, code capabilities, and multi-step planning.

• Key Upgrades: For the first time in the Opus series, we’ve introduced a 1M-token context window (Beta), enabling support for more complex, long-term tasks; coding capabilities have been comprehensively enhanced, allowing the model to autonomously plan, debug, and manipulate large codebases.
• Applicable Scenarios: Financial analysis, legal research, technical documentation writing, collaboration across tables, documents, and presentations, as well as autonomous multi-task agent execution within Cowork.
• Product Value: In the GDPval-AA benchmark, Claude Opus 4.6 outperformed GPT-5.2 by approximately 144 Elo points, and ranked first in highly challenging tests such as Terminal-Bench 2.0 and Humanity’s Last Exam.
• Agent Capabilities: Supports Agent Teams (Claude Code) and Context Compaction (API), enabling long-term execution of complex tasks without losing context.
• Security and Control: Offers Effort Control (low/medium/high/max) to adjust reasoning depth, and features industry-leading alignment safety with low false-negative rates.

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Core Capabilities

🧠 Expert-Level Reasoning

Demonstrates multi-step reasoning abilities close to those of human experts in specialized fields such as finance, law, and life sciences.

💻 Agentic Coding

Can autonomously decompose tasks, invoke tools, and execute subtasks in parallel, handling dozens of GitHub issues per day in organizations of up to 50 people.

🔍 Ultra-Long Context Retrieval

In the 1M-token MRCR v2 “8-needle” test, it achieves an accuracy rate of 76% (Sonnet 4.5 only achieved 18.5%).

📊 Office Productivity Integration

Claude in Excel can automatically infer data structures, while Claude in PowerPoint (Research Preview) can generate entire slide decks according to brand guidelines.

🛡️ Cutting-Edge Security Protection

Added six new cybersecurity probes to prevent model capabilities from being misused for attacks, while accelerating its application in defensive scenarios such as vulnerability discovery.

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Selected Test Data