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 21 Aug.
Custom Kernels for All from Codex and Claude
Open the source for the full engineering note.
Gemini 3 Deep Think: Advancing science, research and engineering
Our most specialized reasoning mode is now updated to solve modern science, research and engineering challenges.
Introducing GPT-5.3-Codex-Spark
Introducing GPT-5.3-Codex-Spark—our first real-time coding model. 15x faster generation, 128k context, now in research preview for ChatGPT Pro users.
OpenEnv in Practice: Evaluating Tool-Using Agents in Real-World Environments
Open the source for the full engineering note.
Harness engineering: leveraging Codex in an agent-first world
By Ryan Lopopolo, Member of the Technical Staff
Accelerating Mathematical and Scientific Discovery with Gemini Deep Think
Research papers point to the growing impact of Deep Think across fields
Bringing ChatGPT to GenAI.mil
OpenAI for Government announces the deployment of a custom ChatGPT on GenAI.mil, bringing secure, safety-forward AI to U.S. defense teams.
Transformers.js v4: Now Available on NPM!
Open the source for the full engineering note.
Making AI work for everyone, everywhere: our approach to localization
OpenAI shares its approach to AI localization, showing how globally shared frontier models can be adapted to local languages, laws, and cultures without compromising safety.
Introducing SyGra Studio
Open the source for the full engineering note.
GPT-5 lowers the cost of cell-free protein synthesis
An autonomous lab combining OpenAI’s GPT-5 with Ginkgo Bioworks’ cloud automation cut cell-free protein synthesis costs by 40% through closed-loop experimentation.
Introducing Trusted Access for Cyber
OpenAI introduces Trusted Access for Cyber, a trust-based framework that expands access to frontier cyber capabilities while strengthening safeguards against misuse.
Introducing OpenAI Frontier
OpenAI Frontier is an enterprise platform for building, deploying, and managing AI agents with shared context, onboarding, permissions, and governance.
Introducing GPT-5.3-Codex
GPT-5.3-Codex is a Codex-native agent that pairs frontier coding performance with general reasoning to support long-horizon, real-world technical work.
GPT-5.3-Codex System Card
GPT‑5.3-Codex is the most capable agentic coding model to date, combining the frontier coding performance of GPT‑5.2-Codex with the reasoning and professional knowledge capabilities of GPT‑5.2.
Unlocking the Codex harness: how we built the App Server
Learn how to embed the Codex agent using the Codex App Server, a bidirectional JSON-RPC API powering streaming progress, tool use, approvals, and diffs.
Community Evals: Because we're done trusting black-box leaderboards over the community
Open the source for the full engineering note.
H Company's new Holo2 model takes the lead in UI Localization
Open the source for the full engineering note.
The Future of the Global Open-Source AI Ecosystem: From DeepSeek to AI+
Open the source for the full engineering note.
Training Design for Text-to-Image Models: Lessons from Ablations
Open the source for the full engineering note.
The Sora feed philosophy
Discover the Sora feed philosophy—built to spark creativity, foster connections, and keep experiences safe with personalized recommendations, parental controls, and strong guardrails.
Snowflake and OpenAI partner to bring frontier intelligence to enterprise data
OpenAI and Snowflake partner in a $200M agreement to bring frontier intelligence into enterprise data, enabling AI agents and insights directly in Snowflake.
Introducing the Codex app
Introducing the Codex app for macOS—a command center for AI coding and software development with multiple agents, parallel workflows, and long-running tasks.
Project Genie: Experimenting with infinite, interactive worlds
Google AI Ultra subscribers in the U.S. can try out Project Genie, an experimental research prototype that lets you create and explore worlds.
Inside OpenAI’s in-house data agent
How OpenAI built an in-house AI data agent that uses GPT-5, Codex, and memory to reason over massive datasets and deliver reliable insights in minutes.