GPT-6.1 Sol

An upgrade to GPT-6 Sol that gets close to GPT-6 Astra on coding, computer use, and document work at about a fifth of Astra's price.

API model id is gpt-6.1-sol at $2 per million input tokens, $0.10 per million cached input tokens, and $10 per million output tokens
Cached input costs half of GPT-6 Sol's, which lowers the bill for agents that resend the same context on every request
In OpenAI's testing it cut answers containing a factual error by about a third compared with GPT-6 Sol at low reasoning effort
OpenAI still points to GPT-6 Astra for the hardest scientific research tasks
Available now to Plus, Pro, Business, Enterprise, and Edu users in ChatGPT Work and Codex, but not yet in regular ChatGPT chat
Supports multi-agent work in beta through the Responses API
An Ultrafast version with up to 8x faster output in Codex is due in the next few days