Modelpeers

GPT-6 Sol changelog

Every change to GPT-6 Sol that Modelpeers has recorded, newest first, each with the source it came from. The record starts Sep 22, 2026.

All (6)Releases (3)Breaking changes (1)Quality (2)

October 2026

GPT-6 Luna character

ChatGPT, GPT-6 Sol and GPT-6 Luna

3 products from OpenAI

Default change

GPT-6 becomes the ChatGPT model on free and paid plans

OpenAI launched GPT-6 to everyone in ChatGPT on free and paid plans globally, replacing GPT-5.6 Sol and GPT-5.6 Luna in ChatGPT. Codex and ChatGPT Work keep the September versions.

Before

GPT-5.6 Sol and GPT-5.6 Luna

After

GPT-6 Sol and GPT-6 Luna

Who is affected:
Everyone using ChatGPT.
What to do:
No action needed. re-check saved prompts and GPTs for changed behavior.

Get this changelog in a feed reader with the RSS feed.