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"ANTHROPIC_BASE_URL": "
This is the base URL you set so Claude Code stops calling Anthropic directly and routes through OpenRouter instead. It’s the key switch that makes the OpenRouter free-model method work inside Claude Code.
Buy on Openrouter
You'll be taken to Openrouter to complete your purchase.
Pros
- +Enables Claude Code to talk to OpenRouter models
- +Simple environment-variable change
Cons
- -Misconfiguration can cause accidental paid model usage if you don’t override all defaults
