Modelpeers

GPT-5.6 Sol changelog

Every change to GPT-5.6 Sol that Modelpeers has recorded, newest first, each with the source it came from. The record starts Jul 9, 2026.

All (7)Releases (3)Breaking changes (1)Prices/limits (3)

August 2026

ChatGPT, GPT-5.6 Sol and GPT-5.6 Luna

3 products from OpenAI

Default change

ChatGPT replaces GPT-5.5 Instant with GPT-5.6 Sol and Luna

Free and Go users got a new default model for everyday chats, and Plus and Pro users got an updated GPT-5.6 Sol with an effort slider. These models replaced GPT-5.5 Instant.

Before

GPT-5.5 Instant

After

GPT-5.6 Sol (Plus, Pro) · new default for Free and Go

Who is affected:
Everyone using ChatGPT.
What to do:
No action needed. Expect different answers than GPT-5.5 Instant.

2 incidents are listed on the GPT-5.6 Sol page. Get this changelog in a feed reader with the RSS feed.