OpenAI API
✓ VerifiedAPI access to GPT-5.1, GPT-5, GPT-4o, images, audio, and tools
Pricing and features change frequently—confirm on the vendor site.
About
OpenAI’s API gives developers pay-per-use access to the latest GPT models (GPT-5.1, GPT-5, GPT-4o, GPT-4.1, GPT-4.1 mini/nano, o-series), plus images (GPT-Image-1), speech (gpt-audio, Whisper), embeddings, and moderation. It supports tool calling, structured outputs, Assistants/Responses/Chat Completions, Batch, Realtime, prompt caching, fine-tuning, and file/image/audio endpoints. Pricing is metered per model; for example, GPT-5.1 Standard is $1.25 per 1M input ($0.125 cached) and $10 per 1M output, or $0.625 / $5 via Batch (see pricing page for all models).
Key Features
- ✓Access to GPT-5.1, GPT-5, GPT-4o, GPT-4.1, GPT-4.1 mini/nano, and o-series models
- ✓Text and image inputs with text outputs; audio (TTS/STT) and image generation endpoints
- ✓Tool calling, structured/JSON outputs, and Assistants/Responses/Chat Completions APIs
- ✓Batch API, Realtime API for low-latency streaming, and prompt caching
- ✓Fine-tuning, embeddings, moderation, and file/image/audio handling
- ✓Snapshots and model aliases for stability; pay-per-use pricing by model
Use Cases
- →General-purpose chat and assistants
- →Code generation, review, and agentic workflows
- →Content creation, summarization, and extraction
- →Image generation and editing
- →Speech-to-text and text-to-speech
- →Embeddings and semantic search
Technical Details
Languages
AI Models
Integrations
Frequently Asked Questions
What is OpenAI API?
OpenAI’s API gives developers pay-per-use access to the latest GPT models (GPT-5.1, GPT-5, GPT-4o, GPT-4.1, GPT-4.1 mini/nano, o-series), plus images (GPT-Image-1), speech (gpt-audio, Whisper), embeddings, and moderation. It supports tool calling, structured outputs, Assistants/Responses/Chat Completions, Batch, Realtime, prompt caching, fine-tuning, and file/image/audio endpoints. Pricing is metered per model; for example, GPT-5.1 Standard is $1.25 per 1M input ($0.125 cached) and $10 per 1M output, or $0.625 / $5 via Batch (see pricing page for all models).
How much does OpenAI API cost?
OpenAI API offers pay-per-use pricing. Plans include: Standard: $1.25 / 1M input, $0.125 cached input, $10 / 1M output for GPT-5.1 (varies by model), Batch: $0.625 / 1M input, $5 / 1M output for GPT-5.1 (varies by model).
What programming languages does OpenAI API support?
OpenAI API supports 1+ programming languages including Any language via REST/HTTP.
What AI models does OpenAI API use?
OpenAI API is powered by gpt-5.1, gpt-5, gpt-4o, gpt-4.1, gpt-4o-mini, o3-pro, o3, gpt-image-1, gpt-audio, whisper-1, text-embedding-3-large.
What platforms does OpenAI API support?
OpenAI API is available on API.
What can OpenAI API do?
OpenAI API provides code completion, code generation, debugging, AI chat, agentic/autonomous mode. Key features include: Access to GPT-5.1, GPT-5, GPT-4o, GPT-4.1, GPT-4.1 mini/nano, and o-series models, Text and image inputs with text outputs; audio (TTS/STT) and image generation endpoints, Tool calling, structured/JSON outputs, and Assistants/Responses/Chat Completions APIs.
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Claude 3.5 Sonnet vs GPT-4o vs Gemini 1.5 Pro: 2025 AI Coding Showdown
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Pricing
Standard
$1.25 / 1M input, $0.125 cached input, $10 / 1M output for GPT-5.1 (varies by model)- •Chat Completions, Responses, Assistants, tool calling, JSON/structured outputs
Batch
$0.625 / 1M input, $5 / 1M output for GPT-5.1 (varies by model)- •Lower-cost Batch API processing
Company
- Name
- OpenAI
- Founded
- 2015
- Location
- San Francisco, CA
Links
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