Field Signal · Curated Reading
The Engineering
Signal.
High-signal field notes, architecture teardowns, and engineering writing from 50 publications. A focused reading queue for becoming a stronger end-to-end engineer. Updated 23 Aug.
Medical research with GPT-5
Learn how GPT-5 is used for medical research.
Exporting data from Redpanda to S3 in batched JSON
Learn how to write messages from Redpanda to its own JSON file in S3.
From hard refusals to safe-completions: toward output-centric safety training
Discover how OpenAI's new safe-completions approach in GPT-5 improves both safety and helpfulness in AI responses—moving beyond hard refusals to nuanced, output-centric safety training for handling dual-use prompts.
GPT-5 System Card
This GPT-5 system card explains how a unified model routing system powers fast and smart responses using gpt-5-main, gpt-5-thinking, and lightweight versions like gpt-5-thinking-nano, optimized for different tasks and developer use.
First look at GPT-5
See how a group of leading developers use GPT-5 for the first time.
Introducing GPT-5
We are introducing GPT‑5, our best AI system yet. GPT‑5 is a significant leap in intelligence over all our previous models, featuring state-of-the-art performance across coding, math, writing, health, visual perception, and more.
How Amgen uses GPT-5
Learn how Amgen uses GPT-5.
How Cursor uses GPT-5
Learn how Cursor uses GPT-5.
Vision Language Model Alignment in TRL ⚡️
Open the source for the full engineering note.
From Intern Project to Production: How I Shipped the Draw Tool for Canva's Present Mode
Overview of the technical hurdles I overcame to evolve my intern project into a new feature for users.
Providing ChatGPT to the Entire U.S. Federal Workforce
Today, OpenAI for Government is announcing a new partnership with the U.S. General Services Administration (GSA) to launch a transformative initiative. For the next year, ChatGPT Enterprise will be available to the entire federal executive branch workforce at essentially no cost.
Redpanda 25.2: Advancing Iceberg integrations for the real-time lakehouse
Check what’s new in Redpanda 25.2 as we expand our Iceberg capabilities, delivering on the promise of a real-time open lakehouse architecture.
Estimating worst case frontier risks of open weight LLMs
In this paper, we study the worst-case frontier risks of releasing gpt-oss. We introduce malicious fine-tuning (MFT), where we attempt to elicit maximum capabilities by fine-tuning gpt-oss to be as capable as possible in two domains: biology and cybersecurity.
Introducing gpt-oss
We’re releasing gpt-oss-120b and gpt-oss-20b—two state-of-the-art open-weight language models that deliver strong real-world performance at low cost. Available under the flexible Apache 2.0 license, these models outperform similarly sized open models on reasoning tasks, demonstrate strong tool use c...
gpt-oss-120b & gpt-oss-20b Model Card
We introduce gpt-oss-120b and gpt-oss-20b, two open-weight reasoning models available under the Apache 2.0 license and our gpt-oss usage policy.
Open Weights and AI for All
AI’s next frontier isn’t just about capability—it’s about who gets to use it. Our mission to put AI in the hands of as many people as possible is what drives us. Today’s release of our most capable open-weights models is a major step forward that makes advanced AI more open, flexible, and accessible...
Welcome GPT OSS, the new open-source model family from OpenAI!
Open the source for the full engineering note.
Measuring Open-Source Llama Nemotron Models on DeepResearch Bench
Open the source for the full engineering note.
Discord Patch Notes: August 4, 2025
Check out the finer details of the more technical fixes implemented into Discord recently.
What we’re optimizing ChatGPT for
We build ChatGPT to help you thrive in all the ways you want. Learn how we’re improving support for tough moments, have rolled out reminders to take breaks, and are working on better life advice, all guided by expert input.
Code Review Can Be Better
Slightly unusual genre today: a negative result about our git-review tool for a different take on code review process, which we decided to shelve, at least for the time being.
When to Hire a Computer Performance Engineering Team (2025) part 1 of 2
As a leader in computer performance I've been asked by companies about how (and why) to form a performance engineering team, and as this is broadly useful I'll share my advice here. Large tech companies in the US hire performance engineers (under that or other titles) to ensure that infrastructure c...
📚 3LM: A Benchmark for Arabic LLMs in STEM and Code
Open the source for the full engineering note.
Figma uses AI to transform digital design
Discover how Figma is transforming digital design with AI. David Kossnick shares how tools like Figma Make empower teams to prototype, collaborate, and build with AI—reshaping workflows for designers, developers, and non-technical creators alike.
Introducing Stargate Norway
We’re launching Stargate Norway—OpenAI’s first AI data center initiative in Europe under our OpenAI for Countries program. Stargate is OpenAI’s overarching infrastructure platform and is a critical part of our long-term vision to deliver the benefits of AI to everyone.