OpenAI changelog: December 2025

9 releases from Dec 4 to December 19, 2025

Everything OpenAI shipped in December 2025, collected from official OpenAI sources. Each entry is dated and links to the page it came from.

December 2025 at a glance

December 2025 was OpenAI's busiest month of the 12 months to then: 9 releases, about 3.7× its monthly average of 2. That was 2 releases more than November 2025. Most were Model (6), followed by Developer Tools (2) and API (1).

Releases

+2 vs November 2025

Rank of 12 months

1st

Average 2.4 a month

Most shipped

Model

6 releases

Notable OpenAI launches in December 2025

ModelDec 19
GPT Image 1.5 in the Responses image generation tool
Added gpt-image-1.5 and chatgpt-image-latest to the Responses API image generation tool.
Source: OpenAI API Changelog
ModelDec 18
GPT-5.2-Codex
Introducing GPT-5.2-Codex, the most advanced agentic coding model for complex software engineering tasks with improvements in context compaction, large code changes, and cybersecurity.
Source: Codex Changelog
ModelDec 16
GPT Image 1.5 and chatgpt-image-latest
Released gpt-image-1.5 and chatgpt-image-latest , our latest and most advanced models for image generation. Read more here .
Source: OpenAI API Changelog

All OpenAI releases in December 2025

Newest first. Each entry links to the official page it came from.

December 20259 releases

Dec 19

GPT Image 1.5 in the Responses image generation tool

Added gpt-image-1.5 and chatgpt-image-latest to the Responses API image generation tool.

ChatGPTModelSource: OpenAI API Changelog

Dec 19

Agent skills in Codex

Agent skills support for reusable task bundles in Codex CLI and IDE extensions

CodexDeveloper ToolsSource: Codex Changelog

Dec 18

GPT-5.2-Codex

Introducing GPT-5.2-Codex, the most advanced agentic coding model for complex software engineering tasks with improvements in context compaction, large code changes, and cybersecurity.

CodexModelSource: Codex Changelog

Dec 16

GPT Image 1.5 and chatgpt-image-latest

Released gpt-image-1.5 and chatgpt-image-latest , our latest and most advanced models for image generation. Read more here .

ChatGPTModelSource: OpenAI API Changelog

Dec 15

New dated audio snapshots for realtime, audio and TTS

Released four new dated audio snapshots (gpt-realtime-mini, gpt-audio-mini, gpt-4o-mini-transcribe, gpt-4o-mini-tts, all 2025-12-15) with reliability, quality and voice fidelity improvements for voice-driven applications. The launch also adds support for custom voices for eligible customers.

OpenAI APIModelSource: OpenAI API Changelog

Dec 11

GPT-5.2

Released GPT-5.2 , the newest flagship model in the GPT-5 model family. GPT-5.2 shows improvements over the previous GPT-5.1 in: General intelligence Instruction following Accuracy and token efficiency Multimodality-especially vision Code generation-especially front-end UI creat…

OpenAI APIModelSource: OpenAI API Changelog

Dec 11

Client-side compaction (/responses/compact)

Released client-side compaction . For long-running conversations with the Responses API, you can use the /responses/compact endpoint to shrink the context you send with each turn.

OpenAI APIAPISource: OpenAI API Changelog

Dec 4

GPT-5.1-Codex-Max in the API

Released gpt-5.1-codex-max to the Responses API, a coding model optimized for long-horizon, agentic coding tasks.

CodexModelSource: OpenAI API Changelog

Dec 4

Codex for Linear

Codex for Linear integration allows users to assign tasks and track progress directly within Linear workflow

CodexDeveloper ToolsSource: Codex Changelog

Where December 2025 sits

OpenAI releases per month, for December 2025 and the 11 months before it. A taller bar means more releases that month; the dated entries for each month are on its own page.