Frontier models

GPT-6 Luna

GPT-6 Luna is the cheaper, faster GPT-6 tier released with GPT-6 Sol on 22 September 2026. The model id is gpt-6-luna. Pricing is $0.10 input and $0.50 output per million tokens. In ChatGPT, OpenAI’s help page says free and Go users get GPT-5.6 Luna, not GPT-6 Luna.

Status: Current
AA score: 38 (max effort)Artificial Analysis Intelligence Index, one independent score across many tests, fetched 8 Oct 2026
Price: $0.10 in, $0.50 outUS dollars per million tokens (word pieces) in and out, unless noted
Released: 22 Sep 2026
Last checked: 12 Oct 2026newest source date on this page

Training

Parameter count, training FLOPs, and a knowledge cutoff for GPT-6 Luna are not in the sources listed on this page.

Inference

reasoning.effort supports none through max.

Context

Context is 1,050,000 tokens. Max output is 128,000. That is the same family shape as Sol on the docs pages.

Methods

Luna is for high-volume, cost-sensitive work. It is not the OpenAI living-table flagship. That row stays GPT-6 Astra.

Benchmarking

GPT-6 Luna (max) scores 38 on the Artificial Analysis Intelligence Index (model page, fetched 8 Oct 2026). Coding Agent Index regresses slightly versus GPT-5.6 Luna in AA’s 22 Sep write-up.

Hardware

OpenAI has not published training or serving silicon details for GPT-6 Luna on the sources listed here. Buyers purchase API tokens.

Access and pricing

Pricing is $0.10 input and $0.50 output per million tokens. Availability: API, ChatGPT Work, and Codex for paid tiers.

Free and Go ChatGPT users get GPT-5.6 Luna, not GPT-6 Luna, per OpenAI’s help page (checked 12 Oct 2026). OpenAI’s 7 Oct launch post says GPT-6 Luna, so the two OpenAI pages disagree. The Intelligent UI page covers the mismatch.