> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lyzr.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic Models

> High-intelligence models known for their safety-first approach, sophisticated reasoning, and industry-leading coding capabilities.

Anthropic’s Claude models are celebrated for their nuanced understanding, minimal refusals, and a unique "hybrid reasoning" capability that allows agents to think deeply before responding. These models are available to use without any configuration.

<AccordionGroup>
  <Accordion title="Claude 3.7 Sonnet (Latest)" defaultOpen={false}>
    Anthropic's first hybrid reasoning model that can toggle between near-instant responses and extended, step-by-step thinking.

    **Use Cases:**

    * High-precision autonomous agents
    * Full-stack software engineering (debugging, planning, refactoring)
    * Computer use (navigating UIs, clicking, and typing)

    **Highlights:**

    * "Extended Thinking" mode for complex logic and math
    * Top-tier performance on SWE-bench (70.3% accuracy)
    * 200K context window with improved instruction following
  </Accordion>

  <Accordion title="Claude 3.5 Haiku (Latest)" defaultOpen={false}>
    The fastest and most cost-effective model in the Claude family, matching the intelligence of previous flagship models.

    **Use Cases:**

    * Real-time customer support chatbots
    * High-volume data classification and extraction
    * Rapid code suggestions and autocomplete

    **Highlights:**

    * Blazing speed with near-zero latency
    * Significantly higher reasoning ability than other "mini" models
    * Excellent at processing unstructured visual data (charts/graphs)
  </Accordion>

  <Accordion title="Claude Opus 4.5" defaultOpen={false}>
    The ultimate frontier model from Anthropic, designed for the most complex enterprise-scale reasoning and long-horizon tasks.

    **Use Cases:**

    * Orchestrating multi-agent systems
    * Handling high-ambiguity research and strategy
    * Large-scale architectural refactors across multiple codebases

    **Highlights:**

    * Best-in-class performance at handling ambiguity and edge cases
    * Superior "goal-directed" behavior for 30+ minute autonomous sessions
    * 20% more token-efficient than Sonnet 4.5 for complex tasks
  </Accordion>

  <Accordion title="Claude Sonnet 4.5" defaultOpen={false}>
    The industry-leading model for agentic coding and computer use, balancing speed with massive intelligence.

    **Use Cases:**

    * Proactive cybersecurity agents (patching vulnerabilities)
    * Advanced financial and predictive analysis
    * Managing complex browser-based workflows

    **Highlights:**

    * Rated as the "best coding model" for agentic tool use
    * Native 64K output token limit for long-form generation
    * 61%+ accuracy on OSWorld (real-world computer tasks)
  </Accordion>

  <Accordion title="Claude Opus 4.0 / 4.1" defaultOpen={false}>
    Advanced flagship models optimized for deep-domain reasoning in law, medicine, and STEM.

    **Use Cases:**

    * Professional-grade legal document review and opinion drafting
    * Scientific research synthesis and discovery
    * Complex litigation and record interrogation

    **Highlights:**

    * "Opus 4.1" features enhanced domain-specific knowledge
    * Maintains context coherence over hundreds of tool calls
    * Highly resistant to sycophancy and hallucinations
  </Accordion>

  <Accordion title="Claude Sonnet 4.0" defaultOpen={false}>
    The versatile workhorse of the Claude 4 family, built for high-volume production and refined aesthetics.

    **Use Cases:**

    * Production-grade content generation and brand-voice alignment
    * Triage and management of CI/CD pipelines
    * High-throughput user-facing assistants

    **Highlights:**

    * Droppable replacement for Sonnet 3.7 with 2x speed
    * Excellent at parallel tool execution (multiple bash/search calls)
    * Balanced performance, responsiveness, and cost
  </Accordion>
</AccordionGroup>

> 🛡️ **Note:** All Anthropic models follow **Constitutional AI** principles, making them the safest choice for enterprise applications where brand risk and alignment are critical.