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OpenAI Developers

@OpenAIDevs

Jan 14 • 7 tweets • 2 min read • Read on X

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GPT-5.2-Codex is now available in the Responses API—the same model available in Codex.

It’s strong at complex long-running tasks like building new features, refactoring code, and finding bugs.

Plus, it’s the most cyber-capable model yet, helping to find and understand codebase vulnerabilities.

platform.openai.com/docs/models/gp…

Check out our prompting guide to get the most out of Codex models: cookbook.openai.com/examples/gpt-5…

https://x.com/cursor_ai/status/2011500027945033904?s=20

Here’s what our customers are saying about GPT-5.2-Codex in the API 👇

https://x.com/cursor_ai/status/2011500027945033904?s=20

https://x.com/windsurf/status/2011504940280062028?s=20

https://x.com/windsurf/status/2011504940280062028?s=20

https://x.com/warpdotdev/status/2011506197279732023

https://x.com/warpdotdev/status/2011506197279732023

https://x.com/FactoryAI/status/2011502511186993648?s=20

https://x.com/FactoryAI/status/2011502511186993648?s=20

https://x.com/github/status/2011501527991546066?s=20

https://x.com/github/status/2011501527991546066?s=20

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More from @OpenAIDevs

OpenAI Developers

@OpenAIDevs

Jan 15

Today we’re announcing Open Responses: an open-source spec for building multi-provider, interoperable LLM interfaces built on top of the original OpenAI Responses API.

✅ Multi-provider by default
✅ Useful for real-world workflows
✅ Extensible without fragmentation

Build agentic systems without rewriting your stack for every model: openresponses.org

https://x.com/ben_burtenshaw/status/2011869403097305271

Builders are already using Open Responses 👀

https://x.com/ben_burtenshaw/status/2011869403097305271

https://x.com/vercel_dev/status/2011874375885341147?s=20

https://x.com/vercel_dev/status/2011874375885341147?s=20

Read 4 tweets

OpenAI Developers

@OpenAIDevs

Dec 19, 2025

🆕 Codex now officially supports skills

Skills are reusable bundles of instructions, scripts, and resources that help Codex complete specific tasks.

You can call a skill directly with $.skill-name, or let Codex choose the right one based on your prompt.

Following the agentskills.io standard, a skill is just a folder: SKILL.md for instructions + metadata, with optional scripts, references, and assets.

We’re looking forward to collaborating on the standard so it’s easy to share and use skill across different tools.

You can install scripts for just yourself in (~/.codex/skills), or for everyone working on a project in (repo_path/.codex/skills).

We’ve also bundled a few handy system skills with Codex, such as plan, skill-creator, and skill-installer.

developers.openai.com/codex/skills

Read 7 tweets

OpenAI Developers

@OpenAIDevs

Nov 7, 2025

You can now get more Codex usage from your plan and credits with three updates today:

1️⃣ GPT-5-Codex-Mini — a more compact and cost-efficient version of GPT-5-Codex
2️⃣ 50% higher rate limits for ChatGPT Plus, Business, and Edu
3️⃣ Priority processing for ChatGPT Pro and Enterprise

GPT-5-Codex-Mini allows roughly 4x more usage than GPT-5-Codex, at a slight capability tradeoff due to the more compact model.

Available in the CLI and IDE extension when you sign in with ChatGPT, with API support coming soon.

Select GPT-5-Codex-Mini for easier tasks or to extend usage when you’re close to hitting rate limits.

Codex will also suggest switching to it when you reach 90% of your limits, so you can work longer without interruptions.

Read 4 tweets

OpenAI Developers

@OpenAIDevs

Aug 21, 2025

Two big updates to the Responses API today.

🖇️ Connectors — Pull context from Gmail, Google Calendar, Dropbox, and more in a single API call.

💬 Conversations — Persist chat threads for your users, without running your own database.

More below:

Build rich experiences with connectors to:

- Read emails
- Fetch calendar events
- Search files and chats

Gmail, Google Calendar, Drive, Dropbox, Teams, Outlook Calendar + Email, and SharePoint are available now.

They work with deep research, too!

platform.openai.com/docs/guides/to…