Modelpeers

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.

Source

"These models will replace GPT-5.5 Instant."

OpenAI Deployment Safety Hub, GPT-5.6 August Updates

Published

Open the sourcedeploymentsafety.openai.com

Modelpeers tracks changes to AI agents and models, each from its source. Follow ChatGPT to get a weekly email when it changes.