Anthropic’s claude is probably the main competing AI to OpenAI’s ChatGPT
Anthropic has an edge over OpenAI in many areas, I personally think it is better than OpenAI for Code generation
To simply chat with Claude, you can create an account at https://claude.ai/
To obtain API keys from anthropic and access the system programmatically, you will need to get the API keys from https://console.anthropic.com/