The new GPT-5.5 Instant model will replace GPT-3.5 Instant as the default model for ChatGPT ...

Instant, featuring improved accuracy and clarity. The model reduces hallucinations by 52.5% and enhances performance in ...

ChatGPT should feel “smarter and more accurate” starting today, according to OpenAI. That’s because the company is replacing ...

ChatGPT should also feel “smarter and more accurate” in general, OpenAI said. In addition, responses should also feel more ...

When ChatGPT first gained popularity in 2022, GPT-3.5 was the default model. In March 2023, the more advanced GPT-4 replaced it. Since then, both models have been lapped by a much more capable GPT-4o, ...

OpenAI details all the improvements users can expect to experience when interacting with ChatGPT's default model.

OpenAI has quietly shipped one of its most meaningful ChatGPT updates in a while. GPT-5.3 Instant isn’t a flashy new model with headline-grabbing benchmark scores. Instead, it fixes the everyday ...

OpenAI makes GPT‑5.5 Instant ChatGPT’s default, cutting hallucinations and boosting personalization with memory sources.

What if your coding assistant could not only write better code but also improve itself in the process? That’s the promise of GPT-5.3 Codex, OpenAI’s latest leap in AI development. Paul Solt explains ...

GPT-5.5 Instant is now the default ChatGPT model. It makes fewer things up, answers more concisely, and finally remembers ...

OpenAI has quietly delivered one of the most noticeable upgrades to ChatGPT in recent memory. As of May 5, 2026, GPT-5.5 Instant is now the default model for all logged-in ChatGPT users worldwide, ...

OpenAI released GPT-5.5 Instant as ChatGPT’s new default model with fewer hallucinations and improved reasoning.