Learn how function calling enables large language models to connect to external data and systems.
OpenAI.fm
An interactive demo for developers to try the latest text-to-speech model in the OpenAI API
Latency optimization | OpenAI API
Improve latency across a wide variety of LLM-related use cases.
OpenAI Model Spec
The Model Spec specifies desired behavior for the models underlying OpenAI's products (including our APIs).
Hatice Ozen on Twitter / X
PSA: @OpenAI is putting the Open back in OpenAI and @GroqInc has Day 0 support. 🤗GPT-OSS 20B and 120B, hybrid-reasoning models with built-in browser search and code execution are now live for instant inference.P.S. We've also launched OpenAI Responses API compatibility. pic.twitter.com/CK7StvMSpr— Hatice Ozen (@ozenhati) August 5, 2025
OpenAI to acquire Ona
OpenAI plans to acquire Ona to expand Codex with secure, persistent cloud environments, enabling long-running AI agents across enterprise workflows.
Tool calling, open source, and the M×N problem
Tool calling with closed-source models is seamless. You pass a list of functions to the API, the model calls them, you get structured JSON back.
openai/openai-realtime-agents
This is a simple demonstration of more advanced, agentic patterns built on top of the Realtime API.
BerriAI/litellm
Python SDK, Proxy Server (AI Gateway) to call 100+ LLM APIs in OpenAI (or native) format, with cost tracking, guardrails, loadbalancing and logging. [Bedrock, Azure, OpenAI, VertexAI, Cohere, Anthropic, Sagemaker, HuggingFace, VLLM, NVIDIA NIM]
Issue · BerriAI/litellm
Python SDK, Proxy Server (AI Gateway) to call 100+ LLM APIs in OpenAI (or native) format, with cost tracking, guardrails, loadbalancing and logging. [Bedrock, Azure, OpenAI, VertexAI, Cohere, Anthr...
Use OpenAI's Responses API with local models
OpenAI-compatible `/v1/responses` endpoint (stateful chats, remote mcp, custom tools)
Azure OpenAI in Foundry Models | Microsoft Azure
Access and fine-tune the latest AI reasoning and multimodal models, integrate AI agents, and deploy secure, enterprise-ready generative AI solutions.
Deprecations | OpenAI API
Find information about OpenAI API deprecations and recommended replacements.
OpenAI
OpenAI is an American AI focused company. Founded in December 2015, OpenAI is best known for their ChatGPT chatbot, also known for the Generative Pre-Trained Transformer...
