Large language models

Inside GPT-5 for Work: How Businesses Use GPT-5

A data-driven report on how workers across industries use ChatGPT—covering adoption trends, top tasks, departmental patterns, and the future of AI at work.

Inside Praktika's conversational approach to language learning

How Praktika uses GPT-4. 1 and GPT-5.

How Higgsfield turns simple ideas into cinematic social videos

Discover how Higgsfield gives creators cinematic, social-first video output from simple inputs using OpenAI GPT-4. 1, GPT-5, and Sora 2.

Differential Transformer V2

Our approach to age prediction

ChatGPT is rolling out age prediction to estimate if accounts are under or over 18, applying safeguards for teens and refining accuracy over time.

A business that scales with the value of intelligence

OpenAI’s business model scales with intelligence—spanning subscriptions, API, ads, commerce, and compute—driven by deepening ChatGPT adoption.

Our approach to advertising and expanding access to ChatGPT

OpenAI plans to test advertising in the U. S.

Introducing ChatGPT Go, now available worldwide

ChatGPT Go is now available worldwide, offering expanded access to GPT-5. 2 Instant, higher usage limits, and longer memory—making advanced AI more affordable globally.

Building with the GPT-5 Model Series: A Practical Guide

A practical guide for startups on migrating to the Responses API, designing agents, tuning prompts, steering GPT-5 models, and building reliable AI workflows.

Inside GPT-5 for Work

A concise guide to how GPT-5 powers real business workflows—across marketing, engineering, finance, strategy, legal, and IT—and how to evaluate it for your team.

OpenAI partners with Cerebras 

OpenAI partners with Cerebras to add 750MW of high-speed AI compute, reducing inference latency and making ChatGPT faster for real-time AI workloads.

Zenken boosts a lean sales team with ChatGPT Enterprise

By rolling out ChatGPT Enterprise company-wide, Zenken has boosted sales performance, cut preparation time, and increased proposal success rates. AI-supported workflows are helping a lean team deliver more personalized, effective customer engagement.

Information-Driven Design of Imaging Systems

An encoder (optical system) maps objects to noiseless images, which noise corrupts into measurements. Our information estimator uses only these noisy measurements and a noise model to quantify how well measurements distinguish objects.

Netomi’s lessons for scaling agentic systems into the enterprise

How Netomi scales enterprise AI agents using GPT-4. 1 and GPT-5.

How Tolan builds voice-first AI with GPT-5.1

Tolan built a voice-first AI companion with GPT-5. 1, combining low-latency responses, real-time context reconstruction, and memory-driven personalities for natural conversations.

Introducing ChatGPT Health

ChatGPT Health is a dedicated experience that securely connects your health data and apps, with privacy protections and a physician-informed design.

The State Of LLMs 2025: Progress, Problems, and Predictions

A 2025 review of large language models, from DeepSeek R1 and RLVR to inference-time scaling, benchmarks, architectures, and predictions for 2026.

LLM Research Papers: The 2025 List (July to December)

In June, I shared a bonus article with my curated and bookmarked research paper lists to the paid subscribers who make this Substack possible.

AprielGuard: A Guardrail for Safety and Adversarial Robustness in Modern LLM Systems

Continuously hardening ChatGPT Atlas against prompt injection

OpenAI is strengthening ChatGPT Atlas against prompt injection attacks using automated red teaming trained with reinforcement learning. This proactive discover-and-patch loop helps identify novel exploits early and harden the browser agent’s defenses as AI becomes more agentic.