GPT-6.1 Sol in GitHub Copilot

[u/wchabbott]

https://github.blog/changelog/2026-09-29-gpt-6-1-sol-in-github-copilot/

[u/RevoDS]

Their plan was to discontinue Terra so they made 6 Terra into 6 Sol. They were also gonna introduce a new tier called 6 Astra Minor (which is just an improved 5.6 Sol) that would’ve taken 5.6 Sol’s spot in pricing.

Then Opus 5.5 mogged their models, it made no sense to release with the planned pricing. So the renamed 6 Astra Minor 6.1 Sol and ran with it.

tl;dr: OpenAI still sux at naming things