OpenAI API
Build AI products on GPT-4, embeddings, and more
OpenAI · APIs
Launched Jun 11, 2020
Quick Answer
OpenAI API is build ai products on gpt-4, embeddings, and more, made by OpenAI. It is a paid product. Key uses: Chatbot backends, Content generation, Embedding search.
Last updated:
Users
3M+ developers (2025)
Revenue
$6B+ OpenAI total ARR (2025 est.)
Growth
200%+ YoY
What is OpenAI API?
The OpenAI API provides programmatic access to GPT-4o, GPT-4, GPT-3.5, DALL-E 3, Whisper, and embeddings models. Powers thousands of AI applications.
How did OpenAI API get started?
API launched Jun 2020 (GPT-3 era). Became the de facto standard for AI APIs. GPT-4 API Mar 2023. Function calling Jun 2023. GPT-4o API May 2024. Realtime API (WebSocket) Sep 2024. o1 API Sep 2024. Batch API for 50% discount on async workloads. GPT-4.5 (preview) Feb 2025. o3 + o4-mini Apr 2025. GPT-4.1 family (1M context, lowest latency) Apr 2025 - major step for long-context apps.
What's new in OpenAI API in 2026?
GPT-4.1 family (Apr 2025, 1M context, 26% cheaper than GPT-4o); o3 flagship reasoning; o4-mini with vision; Responses API for agentic workflows; Realtime API GA; Batch API (50% off); prompt caching
How much does OpenAI API cost?
GPT-4.1
$2.00/1M input tokens
- $8.00/1M output tokens
- 1M token context
- Vision + function calling
- Prompt caching: $0.50/1M
GPT-4.1 mini
$0.40/1M input tokens
- $1.60/1M output tokens
- 1M token context
- Vision
- Best value for high-volume
GPT-4.1 nano
$0.10/1M input tokens
- $0.40/1M output tokens
- Ultra-low cost
- 1M context
- Fast responses
o3
$10/1M input tokens
- $40/1M output tokens
- 200K context
- Best reasoning model
- Reasoning tokens billed separately
o4-mini
$1.10/1M input tokens
- $4.40/1M output tokens
- Vision + reasoning
- 200K context
- Best reasoning value
Embeddings (text-3-large)
$0.13/1M tokens
- 3072 dimensions
- Best retrieval performance
What can you do with OpenAI API?
- Chatbot backends
- Content generation
- Embedding search
- Image generation
Pros
- State-of-the-art models
- Reliable infrastructure
- Extensive documentation
Cons
- Cost at scale
- Rate limits
- Data privacy considerations
What are the best alternatives to OpenAI API?
Compare OpenAI API Head-to-Head
Frequently Asked Questions about OpenAI API
How much does OpenAI API cost?
OpenAI API pricing: GPT-4.1 at $2.00/1M input tokens; GPT-4.1 mini at $0.40/1M input tokens; GPT-4.1 nano at $0.10/1M input tokens; o3 at $10/1M input tokens; o4-mini at $1.10/1M input tokens; Embeddings (text-3-large) at $0.13/1M tokens.
Is OpenAI API free?
OpenAI API is a paid product with no permanent free tier.
What is OpenAI API used for?
OpenAI API is used for: Chatbot backends, Content generation, Embedding search, Image generation.
What are the best alternatives to OpenAI API?
Top alternatives to OpenAI API include Cohere, Anthropic API, Google AI Studio.
What platforms does OpenAI API support?
OpenAI API is available on: REST API, Python SDK, Node.js SDK, Azure OpenAI Service, .NET SDK, Go SDK, Java SDK.
Details
Underlying Models
Platforms
Integrations
Ideal For
- Developers building AI apps
- Enterprises
- Startups
- Researchers
- AI agent builders