GPT-5 mini

Small & localClosed weightsTextReasoning

GPT-5 mini/nano family model by OpenAI.

About the GPT-5 mini/nano family

Small, low-cost members of the original GPT-5 family (Aug 2025), with adjustable reasoning effort down to 'minimal'.

How this one is configured

This configuration runs in reasoning mode (thinks step-by-step before answering).

Also runs at: minimal · medium · high effort

Effort controls how long the model thinks before answering — higher effort usually means better answers on hard problems, at the cost of speed and money. Same model underneath, so they share this page.

Who makes it

OpenAIUnited StatesMaker of ChatGPT and the GPT and o-series model families.