OpenAI releases GPT-5.5 Instant, a new default model for ChatGPT

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

OpenAI says GPT-5.5 Instant to be default model for ChatGPT; widens memory sources

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

OpenAI Just Upgraded ChatGPT's Default Model—Here's What GPT-5.5 Instant Actually Does

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

OpenAI unveils Chat GPT-5 model with 'Ph.D level intelligence'

OpenAI has unveiled its latest and most advanced update for its ChatGPT chatbot yet. The new model, known as GPT-5, is more useful and intuitive than its prior versions, OpenAI CEO Sam Altman said ...
The Droid Guy

I Spent 24 Hours Benchmarking GPT-5.5 Against Claude Opus 4.7 — Here Is What Actually Happened

Within hours I paused an ongoing Opus 4.7 benchmark, swapped the API keys, and ran the exact same methodology on ...