Sycophancy in GPT-4o: what happened and what we’re doing about it

March 20 ChatGPT outage: Here’s what happened

An update on our findings, the actions we’ve taken, and technical details of the bug.

Expanding on what we missed with sycophancy

A deeper dive on our findings, what went wrong, and future changes we’re making.

Spring Update

Introducing GPT-4o and making more capabilities available for free in ChatGPT.

GPT-5.1: A smarter, more conversational ChatGPT

We’re upgrading the GPT-5 series with warmer, more capable models and new ways to customize ChatGPT’s tone and style. GPT-5.

GPT-5.5 Instant: smarter, clearer, and more personalized

GPT-5. 5 Instant updates ChatGPT’s default model with smarter, more accurate answers, reduced hallucinations, and improved personalization controls.

ChatGPT can now see, hear, and speak

Improving GPT‑5.6 Sol in ChatGPT—and expanding access to GPT-5.6 Luna for free users

ChatGPT introduces improved GPT-5. 6 Sol with better accuracy and consistency, plus expanded access for free users and unlimited everyday chats with GPT-5.

Introducing GPT-4o and more tools to ChatGPT free users

Introducing GPT-4o and more tools to ChatGPT free users We are launching our newest flagship model and making more capabilities available for free in ChatGPT.

GPT-5.3 Instant: Smoother, more useful everyday conversations

Fine-tuning now available for GPT-4o

Improving health intelligence in ChatGPT

Learn how GPT-5. 5 Instant improves ChatGPT’s health and wellness responses with stronger reasoning, better context, clearer communication, and physician-informed evaluations.

Retiring GPT-4o, GPT-4.1, GPT-4.1 mini, and OpenAI o4-mini in ChatGPT

On February 13, 2026, alongside the previously announced retirement⁠ of GPT‑5 (Instant, Thinking, and Pro), we will retire GPT‑4o, GPT‑4. 1, GPT‑4.