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Map / Core AI / Foundation Models / ChatGPT / Luna

GPT Luna

by OpenAI · part of ChatGPT · Text

OpenAI's smallest GPT line: the nano models from GPT-4.1 nano on, named Luna from GPT-5.6, for cheap, high-volume tasks.

Latest version

Luna 622 Sep 2026 · 36 days ago

Versions

5since GPT-4.1 nano in April 2025

Typical gap

114 daysmedian between versions, last 12 months

All versions

VersionReleasedAfter previousStatusSource
GPT-6 Luna22 Sep 202675 daysLatestdevelopers.openai.com
GPT-5.6 Luna9 Jul 2026114 daysdevelopers.openai.com
GPT-5.4 nano17 Mar 2026222 daysDeprecateddevelopers.openai.com
GPT-5 nano7 Aug 2025115 daysDeprecateddevelopers.openai.com
GPT-4.1 nano14 Apr 2025FirstRetireddevelopers.openai.com

Dates from OpenAI's own announcements; each row links to its source.

The ChatGPT family

2023202420252026TodayAstraGPT-6 Astra, 3 Sep 20266SolGPT-4, 14 Mar 20234GPT-4 Turbo, 9 Apr 2024GPT-4o, 13 May 20244oGPT-4.5, 27 Feb 2025, previewGPT-4.1, 14 Apr 20254.1GPT-5, 7 Aug 20255GPT-5.1, 12 Nov 2025GPT-5.2, 11 Dec 20255.2GPT-5.4, 5 Mar 2026GPT-5.5, 23 Apr 20265.5GPT-5.6 Sol, 9 Jul 20265.6GPT-6 Sol, 22 Sep 2026GPT-6.1 Sol, 29 Sep 20266.1TerraGPT-4o mini, 18 Jul 20244oGPT-4.1 mini, 14 Apr 20254.1GPT-5 mini, 7 Aug 20255GPT-5.4 mini, 17 Mar 20265.4GPT-5.6 Terra, 9 Jul 20265.6LunaGPT-4.1 nano, 14 Apr 20254.1GPT-5 nano, 7 Aug 20255GPT-5.4 nano, 17 Mar 20265.4GPT-5.6 Luna, 9 Jul 20265.6GPT-6 Luna, 22 Sep 20266o-seriesOpenAI o1, 5 Dec 20241OpenAI o3, 16 Apr 2025OpenAI o4-mini, 16 Apr 20254

VersionPreviewLatest version

Questions

What is the latest version of GPT Luna?

GPT-6 Luna, released on 22 Sep 2026.

When was GPT-5.6 Luna released?

GPT-5.6 Luna came out on 9 Jul 2026.

When was GPT-5.4 nano released?

GPT-5.4 nano came out on 17 Mar 2026.

When was GPT-5 nano released?

GPT-5 nano came out on 7 Aug 2025.

How often is there a new GPT Luna?

Over the last 12 months a new version came about every 114 days (the median gap). 5 versions have come out since GPT-4.1 nano in April 2025.