The fastest and most powerful platform for building AI products
Build transformative AI experiences powered by industry-leading models and tools.
Flagship models
Our frontier models designed to spend more time thinking before producing a response, making them ideal for complex, multi-step problems.
The best model for coding and agentic tasks across industries
Text & vision
Reasoning capabilities
Support for all built-in tools
400k context length | 128k max output tokens
Input: $1.25 | Output: $10.00 per 1M tokens
A faster, cheaper version of GPT-5 for well-defined tasks
Text & vision
Reasoning capabilities
Support for all built-in tools
400k context length | 128k max output tokens
Input: $0.25 | Output: $2.00 per 1M tokens
The fastest, cheapest version of GPT-5—great for summarization and classification tasks
Text & vision
Reasoning capabilities
Support for all built-in tools
400k context length | 128k max output tokens
Input: $0.05 | Output: $0.40 per 1M tokens
Access the power of our models with APIs
Responses API
A new API primitive for agents, combining the simplicity of Chat Completions with the ability to use built-in tools like the Assistants API.
Extend model capabilities with built-in tools
Web Search
Enhance model responses with up-to-date and clearly cited answers from the web using the same capabilities as ChatGPT search.
File search
Build fast, accurate semantic search to augment model responses in just a few lines of code.
Computer use
Build computer-using agents powered by the same model behind Operator, currently in Research Preview.
Code interpreter
Get models to run code iteratively to solve challenging code and math problems, and generate charts.
Customize models for your needs
Fine-tuning
Customize a model’s existing knowledge and behavior for a specific task using text and images via supervised fine-tuning. Plus, use our Model Distillation tools to fine-tune smaller models on the outputs of more capable models.
Build useful and reliable agents
The Agents SDK is a robust and lightweight orchestration framework for designing, building, and deploying agents with built-in observability to track and optimize performance.
See what you can build in Playground
Explore our models and APIs in Playground without writing a single line of code.
Trusted by the world’s most innovative organizations
Enterprise-grade features for operating at scale
Zero data retention policy by request(opens in a new window)
Business Associate Agreements (BAA) for HIPAA compliance(opens in a new window)
Single sign-on (SSO) and multi-factor authentication (MFA)
Data encryption at rest (AES-256) and in transit (TLS 1.2+)
Private Link to securely connect your Azure instances
Scope user roles and API keys to individual projects
Role-based access controls
Limit access to specific models within each project
Set billing and usage restrictions to avoid overages
View granular usage activity by project
Dedicated account team and prioritized support
Guidance on AI deployment and best practices from solutions architects
Opportunity to collaborate with researchers on building custom AI models