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Keep the official anthropic package: change the base URL to the host root without /v1 (the SDK appends /v1/messages itself), use your AI Reserve API key, and every gateway model — not just Claude — answers the same call.
Migrating an existing Anthropic codebase? The Migrating from Anthropic guide covers the full concept mapping. Using Claude Code or the Claude Agent SDK instead? They are configured entirely through environment variables — see the Claude Code recipe.