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Token

The basic unit of text a model processes; roughly 4 English characters or 1–2 Chinese characters per token. Billing and context limits are measured in tokens.

Example: "AI Resource Hub" is about 4–5 tokens. Since APIs charge per input and output token, trimming prompts and responses directly lowers cost.

Related resources

The Complete OpenAI API Guide
A comprehensive, step-by-step guide to the OpenAI API ecosystem, covering GPT, DALL·E, and Whisper models in depth. It walks you through account setup, authentication, making your first API call, prompt design patterns, and cost optimisation strategies—ideal for developers new to the OpenAI platform who want a structured learning path.