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Anthropic Unveils Advanced Claude 4 AI Models Featuring Breakthrough Coding and Reasoning Capabilities

Claude Opus 4 and Sonnet 4 introduce hybrid reasoning, extended memory, and enhanced tool integration, with Sonnet 4 available for free and Opus 4 launching under stricter safety protocols.

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Anthropic unveiled Claude 4, the company's new generation of AI models, on Thursday.
Meet Anthropic's new models, Opus 4 and Sonnet 4.
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Overview

  • Claude Opus 4, Anthropic's most powerful model yet, can autonomously perform complex tasks for up to seven hours, excelling in agentic workflows and long-term coding projects.
  • Both models integrate hybrid reasoning modes, alternating between instant responses and extended thinking, and can use multiple tools in parallel for improved problem-solving.
  • The models include advanced memory capabilities, allowing them to extract, store, and retrieve key information over time, enhancing continuity in long-term tasks.
  • Claude Sonnet 4, optimized for efficiency and general use, is accessible to free users, while Opus 4 is available through paid plans and APIs on platforms like Amazon Bedrock and Google Cloud Vertex AI.
  • Opus 4 is deployed under stricter AI Safety Level 3 (ASL-3) standards, reflecting Anthropic's commitment to responsible scaling and robust safeguards against misuse.