GPT-6.1 Sol
OpenAI's mid-priced GPT-6 workhorse, updated to version 6.1 a week after GPT-6 Sol launched. It costs a fifth of GPT-6 Astra.
- Made by
- OpenAI
- Released
- Type
- Flagship
- Status
- Live
- How to get it
- OpenAI API
- Good for
- Everyday writingAnalysisBuilding apps on the API
What it is
Sol is the middle tier of OpenAI’s GPT-6 family, between the top-end Astra and the low-cost Luna. GPT-6 Sol arrived on September 22, 2026, and GPT-6.1 Sol replaced it on September 29.
What it costs
$2 per million input tokens and $10 per million output tokens, with a context window of about 1.05 million tokens.
What it means for you
For most people building on OpenAI’s API, Sol is the sensible default: strong enough for most tasks and much cheaper than Astra.
Use cases this model is good for
How to summarize a long PDF or contract with AI (without missing the important parts)
You have a 60-page report or contract and need the key points, numbers and risks today, without reading every page.
Best pick: ClaudeUp to 2h savedHow to clean messy spreadsheet data with AI
Your spreadsheet has duplicate rows, five spellings of the same company and three date formats, and the report is due tomorrow.
Best pick: ChatGPTAbout 1h saved
