Guides & glossary
Hand-written, practical guides for calling LLM APIs at the lowest price — and a plain-English glossary of the terms you meet along the way. Looking for the full price list? See the live pricing board.
Cost & pricing
The cheapest Claude API (and how to switch in one line)
A practical guide to calling Claude (Opus, Sonnet, Haiku) for the lowest price: route every request to the cheapest healthy seller through one OpenAI- or Anthropic-compatible key. Live Claude prices inside.
The cheapest GPT API (route it, or switch models in one line)
How to call GPT models for the lowest price — routed to the cheapest healthy seller — or drop to far cheaper open-weight models with a one-line change. OpenAI-compatible, one key, fee included. Live GPT prices inside.
Compatibility & integration
One API key for all LLMs: stop juggling provider accounts
Replace separate OpenAI, Anthropic, Google and DeepSeek keys with one OpenAI- and Anthropic-compatible key that reaches every major LLM — routed to the cheapest healthy seller, fee included. Live prices inside.
What is an OpenAI-compatible API endpoint?
An OpenAI-compatible API endpoint accepts the same requests and returns the same responses as the OpenAI API, so the OpenAI SDK works against it by changing only the base URL. Here is what that means in practice.