From registration to actual use - step by step
Visit OpenAI Platform (platform.openai.com) to register. Sign up with an international email (Gmail recommended); phone verification required (SMS services available). OpenAI is the developer of the GPT model series, offering the world's most popular AI API.
Go to Sign UpVPN required for access from mainland China. Use SMS services like sms-activate.org for phone verification, costing about $0.1-0.5.
On the "API Keys" page, click "Create new secret key" to generate a key. New accounts get $5 free credit (some regions). Bind a credit card in "Billing → Payment methods" to top up. The API Key is only shown once at creation—save it immediately.
Get API Keygpt-4o-mini is 30x cheaper than gpt-4o ($0.15/M vs $5/M input); use mini for daily tasks, gpt-4o only for complex ones.
Chat API: from openai import OpenAI; client = OpenAI(); response = client.chat.completions.create(model="gpt-4o", messages=[...]). The Embedding API vectorizes text. The Assistants API supports building AI assistants with tools and knowledge bases.
Use Structured Outputs (response_format={"type": "json_schema", "json_schema": {...}}) to force GPT to output structured data conforming to JSON Schema—no post-processing needed.
Function Calling lets GPT auto-call your defined functions, suitable for building AI Agents. The Batch API supports asynchronous processing of large request volumes with 50% lower cost, returning within 24 hours. Set monthly spending caps in "Usage" to prevent overspending.
Enable "Projects" to group API Keys by project, with independent budgets and limits per project—facilitating team collaboration and cost attribution.
Chat with OpenAI API directly here
Start chatting with OpenAI API. Try asking anything!
Free users: 3 chats/day. Configure your own API key for unlimited access.
Official API platform for GPT models
OpenAI API is a paid tool. Visit the official website for detailed pricing.
View pricing →| Tool | Rating | Pricing | Best For |
|---|---|---|---|
| OpenAI API ★ | 4.7/5 | Paid | AI Models |
Getting started with OpenAI API is easy: visit the official website, sign up for an account, explore the dashboard, and follow the onboarding tutorial. OpenAI API is designed to be user-friendly with intuitive interfaces and helpful documentation.
OpenAI API is a ai models tool that helps users work more efficiently. Key features include AI-powered automation, intuitive interface, and integration with popular platforms. It's widely used by solopreneurs, small businesses, and enterprises alike.
OpenAI API is Paid. It requires a paid subscription to use. Check their official website for current pricing and trial options.
Popular alternatives to OpenAI API include other top ai models tools. When choosing an alternative, consider factors like pricing, ease of use, feature set, and integration options. You can compare OpenAI API with similar tools on our AI tools comparison page.
OpenAI API pricing is Paid. Visit the official website for the latest pricing plans and discounts.
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