Coding Agent Custom API Cheatsheet: Copy-Paste Configs to Cut Your Token Bill

Coding agents can be redirected to alternative model providers by configuring a base URL, API key, and model ID, with setup differences primarily determined by whether the tool uses Anthropic or OpenAI-compatible APIs. Claude Code uses the Anthropic-style endpoint without a `/v1` suffix and is configured through environment settings, while OpenClaw, Codex, OpenCode, and Cursor use OpenAI-compatible endpoints that require `/v1` and have distinct configuration locations or interfaces. The material presents Atlas Cloud as an example provider that supports both protocols and describes tool-specific requirements, including OpenClaw model allowlisting, Codex’s separate configuration and authentication files, and setting Claude Code’s background model defaults. It argues that custom routing can reduce costs for token-intensive agent workflows by using lower-cost open-weight models for routine tasks while reserving frontier models for more difficult work, and it recommends consolidating tools under one provider to simplify billing, credentials, and spending controls.

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