OpenAI API

Master the OpenAI API: GPT-5, GPT-4o, o-series reasoning models, structured outputs, function calling, batch API, and the patterns that ship the most production AI today.

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6

Lessons

💻

Code Examples

✅

Production-Ready

100%

Free

Lessons in This API

Work through these 6 lessons in order, or jump to whichever topic you need most.

OpenAI API Fundamentals

Beginner

Models, Tiers, and Pricing

Intermediate

Structured Outputs and Function Calling

Intermediate

Batch API for Cost Savings

Intermediate

Rate Limits and Tier Management

Advanced

OpenAI in Production

Advanced