Category API

A practical GPT-4 API guide covering current model choices, pricing, endpoints, setup, code examples, rate limits, and when to use newer GPT-4 variants.

Check OpenAI API status, separate real outages from app-side errors, and use a practical incident checklist for 401, 429, 500, and 503 failures.

Learn how to use the GPT-4o API with the Responses API, vision inputs, structured outputs, pricing, rate limits, and production tips.

ChatGPT Plus is best for a finished chat app. The OpenAI API suits developers needing automation, integrations, and usage-based billing.

Learn how the OpenAI streaming API works, when to use it, how to read Responses API events, and how to build safe streamed text, tool, and JSON flows.

A practical reference for OpenAI API errors, HTTP status codes, SDK exceptions, rate limits, quota failures, streaming errors, and production fixes.

Production OpenAI API best practices for security, reliability, cost control, latency, rate limits, structured outputs, monitoring, and safety.

A practical guide to the OpenAI Responses API, with endpoint basics, code examples, tools, structured outputs, pricing notes, and migration guidance.

Learn how the OpenAI Embeddings API turns text into vectors for semantic search, RAG, clustering, recommendations, and classification.

OpenAI fine tuning guide for developers: learn when to fine-tune, format data, start jobs, control costs, and evaluate results.

A practical guide to the OpenAI Realtime API for voice agents, WebRTC, WebSockets, SIP, streaming, pricing, VAD, function calling, and production design.

Use our OpenAI API cost calculator to estimate monthly token spend, compare model costs, and plan production API budgets before you ship.