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Claude Opus 5.5: Anthropic’s 1M token context window specs

LLM Stats USA
Overview
Anthropic launched Claude Opus 5.5 on September 22, 2026, a large language model supporting multimodal input with a 1M token context window. Priced at $4.00 per million input tokens, $0.200 per million cached input tokens, and $20.00 per million output tokens, Claude Opus 5.5 is the inaugural model in the Claude 5.5 family, specifically designed for extended ‘agentic’ coding and knowledge-intensive work, significantly enhancing complex task processing capabilities.
In Depth

Key Findings

Anthropic announced the highly anticipated large language model, ‘Claude Opus 5.5,’ on September 22, 2026. This new model supports multimodal input and features an impressive 1 million token (1M token) context window. It is specifically engineered for prolonged and complex ‘agentic’ coding and knowledge-intensive tasks, elevating AI’s advanced problem-solving capabilities to a new echelon.

Technical/Clinical Details

The key technical features and pricing structure for Claude Opus 5.5 are as follows:

  • Multimodal Input Support: The model can process not only text information but also image and other media formats, enabling its use in a wider range of applications. This provides a significant advantage in complex tasks involving visual information, such as analyzing data within images or generating explanations for diagrams.
  • 1M Token Context Window: The expansive context window of 1 million tokens allows for the processing of exceptionally large volumes of information that were previously challenging for older models, including the analysis of lengthy documents, comprehension of complex codebases, and maintenance of extended conversations. This empowers AI agents to make decisions and take actions based on deeper contextual understanding.
  • Pricing Structure:
    • Per million input tokens: $4.00
    • Per million cached input tokens: $0.200
    • Per million output tokens: $20.00

    This pricing is designed for high-performance, large-scale enterprise deployments.

Claude Opus 5.5 is the first model in Anthropic’s Claude 5.5 family, setting the direction for subsequent releases in the series.

Background & Context

The evolution of large language models has progressed in two main directions: the expansion of context windows and the enhancement of multimodal capabilities. A longer context window is crucial for AI to ‘remember’ more information at once and perform complex reasoning. Furthermore, the ability to process non-textual information is indispensable for AI to function more generally in real-world problem-solving scenarios. Claude Opus 5.5 integrates these cutting-edge advancements, accelerating the adoption of AI in information-intensive and complex task-oriented fields such as software development, research, consulting, and creative industries.

Strategic Significance & Outlook

The release of Claude Opus 5.5 marks a significant milestone towards a future where agentic AI can handle more autonomous and sophisticated tasks. The 1M token context window broadens the possibilities for AI to assist and execute many complex tasks previously performed by humans, such as reviewing extensive legal documents, comprehensive analysis of scientific papers, and supporting large-scale project planning and execution. Moving forward, models like Opus 5.5 are expected to form the core of enterprise agentic AI strategies, contributing to increased productivity and the creation of new innovations. Continuous research and development regarding security and ethical use will further drive its adoption.

Source: https://llm-stats.com/models/claude-opus-5-5

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