How Claude Code's ANTHROPIC_BASE_URL works, and how to check that a relay really serves Claude

<p>Before you put a cheap Claude Code relay (an API proxy) in front of your work, it is worth checking for yourself that Claude is the model answering. The first half of this post covers the environment variables Claude Code reads; the second half is a set of checks that work against any relay. I run a relay called CoreCode (disclosure at the end).</p> <h2> 1. The environment variables Claude Code

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