Model
GPT-5.6 Sol.
Power
—
API cost
by OpenAI · released 9 July 2026
In plain English
OpenAI's previous workhorse, still widely used in existing systems.
Good for
Workflows that have already been tested on this model.
Things to be aware of
No retirement date has been announced, and OpenAI points people to it as the replacement for many older models it's retiring. It was one of the two models in the July 2026 Hugging Face incident.
What OpenAI says
“OpenAI positioned it as a flagship for complex professional work.”
- Context window
- 1.1M tokens
- Knows up to
- February 2026
- Run it yourself
- No, online only