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 launches new initiative to help find and patch open source bugs | TechCrunch
OpenAI is using AI to help the open source community better protect itself.
