GPT-6.1 Sol

The newest Sol, near GPT-6 Astra on complex work at a fifth of its price.

Vendor: OpenAI
Released: Sep 2026
Model id: gpt-6.1-sol

GPT-6.1 Sol is the newest Sol in OpenAI’s GPT-6 line, and OpenAI places it near GPT-6 Astra on complex work. It costs a fifth of what Astra costs, the same as GPT-6 Sol on input and output, and half as much as GPT-6 Sol on cached input. It holds about a million tokens of context.

It reasons before it answers.

Best for: hard research, writing and coding on OpenAI, for far less than Astra.

Run GPT-6.1 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.