Chat with Claude 4 for Free — AI's Coding Revolution

Access Anthropic's groundbreaking Claude 4 Opus & Sonnet models free. Code, create, and automate with Claude 4, the most advanced AI assistant capable of working continuously for 7 hours.

What's Claude 4?

Claude 4 represents Anthropic's most advanced AI breakthrough, featuring Claude 4 hybrid models with two powerful modes: near-instant responses and extended thinking for complex reasoning. Claude 4 is available in Claude 4 Opus and Claude 4 Sonnet versions, revolutionizing AI coding, automation, and problem-solving capabilities.

Revolutionary Claude 4 Features and Capabilities

Claude 4 introduces extended thinking with tool use, allowing Claude 4 models to alternate between deep reasoning and tool utilization like web search. Both Claude 4 models support parallel tool usage, follow instructions with enhanced precision, and demonstrate significantly improved memory capabilities when accessing local files. The new Claude 4 Code is now generally available with GitHub Actions integration and native VS Code support.

Claude 4 Opus: World's Best AI Coding Model

Claude 4 Opus achieves unprecedented coding performance with 72.5% on SWE-bench and 43.2% on Terminal-bench, establishing Claude 4 as the world's leading coding AI model. This powerful Claude 4 AI can work continuously for several hours, handling thousands of complex steps with sustained performance that dramatically outperforms previous models.

Industry leaders recognize Claude 4 superiority: Cursor calls Claude 4 state-of-the-art for coding with breakthrough codebase understanding. Replit reports Claude 4 improved precision for complex multi-file changes. Block confirms Claude 4 is the first model to enhance code quality during editing and debugging. Rakuten successfully validated Claude 4 capabilities with a 7-hour independent refactor project.

Claude 4 Sonnet: Optimal Balance of Performance and Efficiency

Claude 4 Sonnet significantly improves upon Sonnet 3.7's industry-leading capabilities, achieving 72.7% on SWE-bench while maintaining optimal efficiency. This Claude 4 model excels in agentic scenarios and will power GitHub Copilot's new coding agent, offering enhanced steerability and superior instruction following.

Development teams praise Claude 4 autonomous capabilities: iGent reports Claude 4 excellence in multi-feature app development with near-zero navigation errors. Sourcegraph highlights Claude 4 substantial improvements in software development with deeper problem understanding and elegant code quality. Augment Code confirms Claude 4 higher success rates and more surgical code editing precision.

Advanced Claude 4 API Capabilities for Developers

Claude 4 introduces four powerful new API capabilities: Claude 4 code execution tool for running and testing code directly, Claude 4 MCP connector for model context protocol integration, Claude 4 Files API for enhanced file management, and Claude 4 prompt caching for up to one hour. These Claude 4 features enable developers to build more sophisticated AI agents and applications.

Claude 4 Availability and Pricing

Both Claude 4 models are available on Anthropic API, Amazon Bedrock, and Google Cloud Vertex AI. Claude 4 Opus pricing remains at $15/$75 per million tokens (input/output), while Claude 4 Sonnet costs $3/$15 per million tokens. Pro, Max, Team, and Enterprise plans include both Claude 4 models with extended thinking, and Claude 4 Sonnet is available to free users.

Why Choose Claude 4 for AI Development

Claude 4 advances AI strategies across coding, research, writing, and scientific discovery. Claude 4 Opus pushes boundaries in complex problem-solving and long-running tasks, while Claude 4 Sonnet brings frontier AI performance to everyday development workflows. Experience the future of AI coding with Claude 4's revolutionary capabilities.

How to Access Claude 4 API - Complete Guide

Accessing Claude 4 APIs requires proper setup through Anthropic's developer console and understanding of Claude 4 authentication protocols. This comprehensive Claude 4 guide covers everything from account creation to production deployment for both Claude 4 Opus and Claude 4 Sonnet integration.

Setting Up Your Claude 4 Developer Account

Generating and Managing Claude 4 API Keys

Claude 4 API Integration Implementation

Claude 4 Sonnet API Access and Configuration

Claude 4 Authentication and Security Best Practices

Testing Claude 4 APIs with Professional Tools

Claude 4 Cost Management and Token Optimization

Claude 4 Production Deployment and Scaling

Claude 4 Comparison: Opus vs Sonnet Models

Claude 4 offers two powerful models from Anthropic, each Claude 4 variant designed for different use cases. Here's a detailed Claude 4 comparison of their capabilities and features.

Claude 4 Opus: Premium Performance Model

Claude 4 Opus achieves unprecedented coding performance with 72.5% on SWE-bench and 43.2% on Terminal-bench, establishing Claude 4 as the world's leading coding AI model. This powerful Claude 4 AI can work continuously for several hours, handling thousands of complex steps with sustained Claude 4 performance that dramatically outperforms previous models.

Claude 4 Sonnet: Efficiency-Focused Model

Claude 4 Sonnet significantly improves upon Sonnet 3.7's industry-leading capabilities, achieving 72.7% on SWE-bench while maintaining optimal Claude 4 efficiency. This Claude 4 model excels in agentic scenarios and will power GitHub Copilot's new coding agent, offering enhanced Claude 4 steerability and superior instruction following.

Claude 4 Key Differences and Use Cases

Claude 4 Opus excels in complex coding tasks requiring deep reasoning and long-running processes, while Claude 4 Sonnet offers a balanced approach between performance and efficiency. Both Claude 4 models support parallel tool usage, follow instructions with enhanced precision, and demonstrate significantly improved Claude 4 memory capabilities when accessing local files.

Claude 4 Code: GitHub Actions and VS Code Integration

The new Claude 4 Code is now generally available with GitHub Actions integration and native VS Code support. This Claude 4 feature enables developers to automate code execution, testing, and debugging workflows, significantly enhancing productivity and Claude 4 development efficiency.

Claude 4 AI: The Future of Artificial Intelligence Development

Claude 4 AI represents a revolutionary leap in artificial intelligence technology, combining advanced reasoning capabilities with practical coding excellence. This Claude 4 AI platform delivers unprecedented performance across multiple domains, establishing itself as the premier choice for developers, researchers, and enterprises seeking cutting-edge AI solutions.

Superior Features

Industry Applications

Performance Metrics

Getting Started

Community

What Makes Claude 4 AI Superior to Other AI Models

Claude 4 AI distinguishes itself through exceptional benchmark performance and real-world applications. Unlike traditional AI models, Claude 4 AI provides sustained performance over extended work sessions, making it the ideal Claude 4 AI solution for complex projects requiring continuous attention and multi-step reasoning processes.

The Claude 4 AI architecture incorporates advanced memory management and context understanding, enabling developers to build sophisticated applications that maintain coherence across lengthy interactions. This Claude 4 AI capability proves invaluable for enterprise-grade solutions requiring reliable, consistent performance.

Ready to Experience Claude 4 AI?

Join thousands of developers already building the future with Claude 4's revolutionary AI capabilities.