- One API key for Claude, GPT, Gemini and DeepSeekCall Claude, GPT, Gemini and DeepSeek with one OpenAI-compatible API key. Switch models by changing one parameter. Python, Node.js and curl examples.
- How to use Claude Code with a custom API endpointPoint Claude Code at a custom endpoint with ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN. Setup for macOS, Linux and Windows, settings.json, how to verify, cost tips.
- Claude Code API errors and fixes: 401, 403, 404, 429, 5xxFix Claude Code API errors with a custom endpoint: 401 invalid key, 403 balance, 404 model or /v1 base URL, 429 rate limit, 5xx, env not loaded, proxy and VPN issues.
- How to use Cursor with your own API key and base URLSet up Cursor with your own OpenAI-compatible API key: override the OpenAI base URL, add Claude, GPT, Gemini or DeepSeek model names, verify, and fix common errors.
- Claude vs GPT vs Gemini vs DeepSeek: which model for which jobPick the right AI model for coding, writing, long documents and cheap bulk work. Practical traits of Claude, GPT, Gemini and DeepSeek, and how to test them on your own prompts.
How AI API token pricing works and how to estimate your billUnderstand AI API token pricing: input vs output tokens, price per 1M tokens, why long chats cost more, max_tokens, and a simple formula to estimate your monthly bill.- Add AI to n8n workflows with an OpenAI-compatible APIUse Claude, GPT, Gemini or DeepSeek in n8n: create an OpenAI credential with a custom Base URL, pick a model, and build an example workflow with the AI nodes or HTTP Request.