Function calling and other API updates

Introducing more enterprise-grade features for API customers

Increasing enterprise support with more security features and controls, updates to our Assistants API, and tools to better manage costs.

Introducing improvements to the fine-tuning API and expanding our custom models program

We’re adding new features to help developers have more control over fine-tuning and announcing new ways to build custom models with OpenAI.

Introducing Structured Outputs in the API

We are introducing Structured Outputs in the API—model outputs now reliably adhere to developer-supplied JSON Schemas.

New tools and features in the Responses API

New embedding models and API updates

Extending FunctionGemma for Practical On-Device Mobile Function Calling

arXiv:2609.25373v1 Announce Type: new Abstract: On-device assistants require function-calling models that map natural language to local system actions, but existing resources emphasize web APIs or na...

New models and developer products announced at DevDay

GPT-4 Turbo with 128K context and lower prices, the new Assistants API, GPT-4 Turbo with Vision, DALL·E 3 API, and more.

OpenAI API

We’re releasing an API for accessing new AI models developed by OpenAI.

GPT-4 API general availability and deprecation of older models in the Completions API

GPT-3. 5 Turbo, DALL·E and Whisper APIs are also generally available, and we are releasing a deprecation plan for older models of the Completions API, which will retire at the beginning of 2024.

From Fixed Keys to Readable Schemas: Small Language Models for Vehicle Agent Function Calls

arXiv:2609.09476v1 Announce Type: cross Abstract: In-vehicle assistants must translate natural-language requests into accurate vehicle function calls under strict memory and latency constraints, maki...

DevDay 2026 Recap

The OpenAI DevDay 2026 recap highlights over 20 new announcements, featuring the GPT‑6 Astra model, updates to ChatGPT and Codex, expanded APIs, enhanced security measures, and fresh tools designed for developers.

Introducing GPT-4.1 in the API

Introducing GPT-4. 1 in the API—a new family of models with across-the-board improvements, including major gains in coding, instruction following, and long-context understanding.