Anthropic Claude Has a Free API Tier — Build AI Apps With the Smartest Model for Coding and Analysis

Anthropic gives developers free API credits when they sign up — enough to test Claude's capabilities for coding assistance, data analysis, content generation, and complex reasoning. Claude consistently ranks as the top model for code generation and long-context understanding. Get Your Free API Key Sign up at console.anthropic.com Go to API Keys → "Create Key" New accounts get $5 free credit Copy your key (starts with sk-ant- ) 1. Send a Message curl https://api.anthropic.com/v1/messages \ -H "x-api-key: sk-ant-YOUR_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "Content-Type: application/json" \ -d '{ "model": "claude-sonnet-4-6", "max_tokens": 1024, "messages": [ {"role": "user", "content": "Write a Python function to parse JSON from a URL and handle errors gracefully."} ] }' 2. System Prompts for Specialized Assistants curl https://api.anthropic.com/v1/messages \ -H "x-api-key: sk-ant-YOUR_KEY" \ -H "anthropic-version: 2023-06-01" \ -H "Content-Type: application/json" \ -d '{ "model"