BL 11/19/2025

GPT-5.1-Codex-Max System Card

System card detailing safety measures for GPT-5.1-Codex-Max including specialized training, agent sandboxing, and network access controls.

BL 11/19/2025

Building more with GPT-5.1-Codex-Max

OpenAI introduces GPT-5.1-Codex-Max, a frontier agentic coding model for software engineering with improved reasoning and token efficiency.

BL 11/13/2025

Introducing GPT-5.1 for developers

OpenAI releases GPT-5.1 for API with dynamic reasoning adaptation, token efficiency, and no-reasoning mode for agentic and coding tasks.

BL 11/13/2025

Introducing group chats in ChatGPT

ChatGPT introduces group chat feature allowing multiple users to collaborate with each other and ChatGPT in the same conversation.

BL 10/29/2025

Introducing gpt-oss-safeguard

Release of gpt-oss-safeguard open-weight models for safety classification with custom policies under Apache 2.0. Open-source developer tool.

BL 10/29/2025

gpt-oss-safeguard technical report

Technical report on gpt-oss-safeguard open-weight reasoning models (120b, 20b) for custom safety policy classification. Open-source research.

BL 9/29/2025

Building OpenAI with OpenAI

OpenAI blog introducing series on internal use of their own technology and APIs across teams.