GPT-6 Luna

The smallest and least expensive GPT-6.

Vendor: OpenAI
Released: Sep 2026
Model id: gpt-6-luna

GPT-6 Luna is the smallest model in OpenAI’s GPT-6 line. It costs a twentieth of what GPT-6 Sol costs on both input and output, and it holds about a million tokens of context.

Best for: quick, frequent work where cost matters more than depth: sorting, summarizing, short answers.

Run GPT-6 Luna 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.