Changed API key reference from ${ANTHROPIC_API_KEY} to
os.environ/ANTHROPIC_API_KEY to match LiteLLM's documented syntax.
The os.environ/ prefix tells LiteLLM to use os.getenv() to retrieve
the environment variable at runtime, which is the correct way to
reference environment variables in LiteLLM config files.
Reference: https://docs.litellm.ai/docs/proxy/deploy
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Co-Authored-By: Claude <noreply@anthropic.com>