GPT-6 Sol

The middle GPT-6, at half the price of GPT-5.6 Sol.

Vendor: OpenAI
Released: Sep 2026
Model id: gpt-6-sol

GPT-6 Sol is the middle model in OpenAI’s GPT-6 line, between Astra and Luna. It costs half what GPT-5.6 Sol costs on both input and output, and it holds about a million tokens of context.

It reasons before it answers.

Best for: everyday research, writing and coding on OpenAI, for less than GPT-5.6 Sol.

Run GPT-6 Sol in a workspace

Pick it per workspace from the model settings and switch any time. Inference is included in the plan, or bring a key of the team's own.