OpenAI API
✓ VerifiedAPI access to GPT-5.2, Codex models, Responses API, Agents SDK, and the full OpenAI platform
About
The OpenAI API provides pay-per-use access to the GPT-5 family (GPT-5.2 flagship at $1.75/$14 per MTok, GPT-5 at $1.25/$10, GPT-5 Mini at $0.25/$2, GPT-5 Nano at $0.05/$0.40), Codex-oriented models for agentic coding, reasoning models (o3, o4-mini), and GPT-4.1 with 1M token context. The Responses API (launched March 2025) replaces the older Assistants API with built-in tools including web_search, file_search, and computer_use. The Agents SDK provides a Python framework for building multi-agent systems with handoffs, guardrails, and tracing. Also includes image generation (DALL-E), audio (TTS/STT), embeddings, and the Sora 2 video generation API.
Key Features
- ✓GPT-5.2 flagship (71.8% SWE-bench), GPT-5, GPT-4.1 (1M context), o3/o4-mini reasoning
- ✓Responses API with built-in web_search, file_search, and computer_use tools
- ✓Agents SDK: Python framework for multi-agent systems with handoffs and guardrails
- ✓Codex models (GPT-5.2-Codex, GPT-5.3-Codex) optimized for agentic coding
- ✓GPT-5 Nano ($0.05/MTok input) for ultra-budget high-volume applications
- ✓Image generation (DALL-E), audio (TTS/STT), and Sora 2 video generation API
- ✓Prompt caching, batch processing (50% savings), and fine-tuning
- ✓Structured outputs, function calling, and streaming
- ✓GPT-OSS open-weight models (20B/120B, Apache 2.0) available via Ollama
- ✓Deployment via API, Azure OpenAI Service, and Frontier enterprise platform
Pros & Cons
Pros
- GPT-5.2 at 71.8% SWE-bench; GPT-4.1 with 1M token context
- Responses API with web_search, file_search, computer_use tools
- GPT-5 Nano at $0.05/MTok for budget high-volume use
Cons
- Premium pricing for flagship models
- 30-day default data retention (zero-retention opt-in)
Use Cases
- →Building AI agents with the Responses API and Agents SDK
- →Agentic coding with Codex models (1M+ developers)
- →Long-document analysis with GPT-4.1 (1M token context)
- →Budget-friendly high-volume processing with GPT-5 Nano ($0.05/MTok)
- →Image, audio, and video generation (DALL-E, Sora 2)
- →Enterprise AI agent deployment via OpenAI Frontier platform
- →Multi-agent orchestration with handoffs and guardrails
Technical Details
Languages
AI Models
Integrations
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Frequently Asked Questions
What is OpenAI API?
The OpenAI API provides pay-per-use access to the GPT-5 family (GPT-5.2 flagship at $1.75/$14 per MTok, GPT-5 at $1.25/$10, GPT-5 Mini at $0.25/$2, GPT-5 Nano at $0.05/$0.40), Codex-oriented models for agentic coding, reasoning models (o3, o4-mini), and GPT-4.1 with 1M token context. The Responses API (launched March 2025) replaces the older Assistants API with built-in tools including web_search, file_search, and computer_use. The Agents SDK provides a Python framework for building multi-agent systems with handoffs, guardrails, and tracing. Also includes image generation (DALL-E), audio (TTS/STT), embeddings, and the Sora 2 video generation API.
How much does OpenAI API cost?
OpenAI API offers pay-per-use pricing. Plans include: GPT-5.2 (Flagship): $1.75 / 1M input, $14 / 1M output, GPT-5: $1.25 / 1M input, $10 / 1M output, GPT-4.1: $2 / 1M input, $8 / 1M output, GPT-5 Mini / Nano: Mini: $0.25/$2 | Nano: $0.05/$0.40 per MTok, Batch: 50% discount vs standard pricing.
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-5.2, gpt-5, gpt-5.3-codex, gpt-5-codex, gpt-4.1, o3, o3-pro, o4-mini, gpt-5-mini, gpt-5-nano, gpt-image-1, whisper-1.
What platforms does OpenAI API support?
OpenAI API is available on API, Web, Desktop.
What can OpenAI API do?
OpenAI API provides code completion, code generation, debugging, AI chat, agentic/autonomous mode. Key features include: GPT-5.2 flagship (71.8% SWE-bench), GPT-5, GPT-4.1 (1M context), o3/o4-mini reasoning, Responses API with built-in web_search, file_search, and computer_use tools, Agents SDK: Python framework for multi-agent systems with handoffs and guardrails.
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Workflow Resources
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Pricing
GPT-5.2 (Flagship)
$1.75 / 1M input, $14 / 1M output
- Default ChatGPT model (Feb 2026)
- 71.8% SWE-bench Verified
- 400K context window
- All API endpoints supported
GPT-5
$1.25 / 1M input, $10 / 1M output
- 70.1% SWE-bench Verified
- 400K context window
- Reasoning tokens with configurable effort
GPT-4.1
$2 / 1M input, $8 / 1M output
- 1M token context window (largest available)
- Strong for long-document analysis
GPT-5 Mini / Nano
Mini: $0.25/$2 | Nano: $0.05/$0.40 per MTok
- Ultra-low-cost for high-volume applications
- 200K context window
Batch
50% discount vs standard pricing
- Lower-cost higher-latency processing
Company
- Name
- OpenAI
- Founded
- 2015
- Location
- San Francisco, CA
- Users
- 200M+ ChatGPT weekly active users
Links
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