title: "Anthropic Authentication for Opencode"
description: "How to configure Anthropic API authentication correctly when using opencode."
keywords:
- opencode anthropic auth
- anthropic api key opencode
Anthropic Authentication for Opencode
Opencode requires a valid Anthropic API key to work with Claude.
Required environment variable
export ANTHROPIC_API_KEY=your_api_key_here
Common mistakes
- Using Claude Code credentials
- Forgetting to export the variable
- Using expired keys
Test your setup
opencode --version
If authentication fails, check your environment variables.