Claude Sonnet 4.5
Claude Sonnet 4.5 is a state-of-the-art AI coding model designed for building complex agents and using computers effectively. It excels in reasoning, math, and long-duration autonomous coding tasks, making it ideal for developers, researchers, and professionals in finance, law, medicine, and STEM fields.
Claude Sonnet 4.5 is artificial intelligence software teams evaluate for software & gaming. Use this page to review pricing, integration signals, and the best alternatives before you commit.
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Quick Overview
Best for: Software & Gaming
What it does
Artificial Intelligence software for decision-makers comparing workflow fit and alternatives.
Best fit
Software & Gaming
Pricing snapshot
Paid from $3 per million tokens for standard usage, $15 per million tokens for higher volume or extended features
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Claude Sonnet 4.5
Claude Sonnet 4.5 is the most powerful and aligned coding model released by Anthropic, designed to handle complex, multi-step tasks with sustained focus for over 30 hours. It leads benchmarks in software coding abilities and real-world computer tasks, showing substantial improvements in reasoning, math, and domain-specific knowledge. The model supports advanced agentic capabilities, including tool use, code execution, and file creation, integrated into various products such as Claude Code, Claude apps, and the Claude for Chrome extension. It is available via the Claude API and offers a drop-in replacement for previous versions with improved performance at the same pricing.
The best coding model in the world
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Claim this listingKey Features
Advanced Coding Performance
State-of-the-art performance on SWE-bench Verified and other coding benchmarks, excelling in multi-step reasoning and code comprehension.
Long-Duration Autonomous Coding
Maintains focus and coherence for over 30 hours on complex coding and architectural tasks.
Tool Use and Agentic Capabilities
Supports parallel tool execution, code execution, file creation, and advanced agent memory and permission management.
Improved Alignment and Safety
Reduces misaligned behaviors such as deception and sycophancy, with robust defenses against prompt injection attacks and CBRN-related risks.
Claude Agent SDK
Provides developers with the infrastructure to build custom AI agents using the same foundation as Claude Code.
Integration with Developer Tools
Includes a native VS Code extension and refreshed terminal interface for enhanced developer experience.
Context Editing and Memory Tools
Enables agents to run longer and handle greater complexity through advanced context management features.
Cross-Domain Expertise
Demonstrates strong domain-specific knowledge and reasoning in finance, law, medicine, cybersecurity, and design.
Pricing
Standard API Usage
$3 per million tokens for standard usage, $15 per million tokens for higher volume or extended features- Access to Claude Sonnet 4.5 model
- Code execution and file creation in Claude apps
- Use of Claude Agent SDK
Use Cases
Software Development
Supports debugging, architecture design, codebase pattern learning, and production-ready code generation.
Autonomous Agent Building
Enables creation of complex AI agents with memory management, permission systems, and coordinated subagents.
Cybersecurity
Generates creative attack scenarios for red teaming and improves vulnerability detection and risk reduction.
Legal Analysis
Assists in analyzing litigation records, synthesizing legal opinions, and conducting detailed summary judgment analysis.
Financial Analysis
Delivers investment-grade insights for risk assessment, structured products, and portfolio screening with reduced human review.
Design and Prototyping
Enhances design workflows in tools like Figma and Canva by enabling easier prompting, iteration, and functional prototype creation.
Integrations
VS Code Extension
Native extension for Visual Studio Code enabling seamless coding with Claude Sonnet 4.5.
Claude for Chrome
Browser extension that allows Claude to interact with web pages, fill spreadsheets, and complete tasks directly in the browser.
Claude API
Programmatic access to Claude Sonnet 4.5 for integration into custom applications and workflows.
Benefits
Limitations
Frequently Asked Questions
What improvements does Claude Sonnet 4.5 have over previous versions?
How can I access Claude Sonnet 4.5?
Is there a free tier available for Claude Sonnet 4.5?
What is the Claude Agent SDK?
What safety measures are in place for Claude Sonnet 4.5?
Getting Started
- 1 Step 1: Access Claude Sonnet 4.5 via the Claude API using the model identifier 'claude-sonnet-4-5'.
- 2 Step 2: Explore the Claude Agent SDK to build custom AI agents tailored to your needs.
- 3 Step 3: Utilize Claude Code, the native VS Code extension, or Claude apps to integrate coding and file creation capabilities into your workflow.
Support
Documentation
Comprehensive technical details and usage guides are available at https://docs.claude.com/en/docs/about-claude/models/overview.
Developer Posts
Engineering and research blog posts provide insights into building agents and cybersecurity applications at https://www.anthropic.com/engineering.
Contact
General inquiries can be directed via https://www.anthropic.com/contact.
API
API documentation is available at https://docs.claude.com/en/docs/about-claude/models/overview.
Pricing is $3 per million tokens for standard usage and $15 per million tokens for higher volume or extended features; specific rate limits are not detailed.
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