OpenAI

Model timelines and latest releases from OpenAI.

Model timelines

Release history per model from this vendor. Click any marker for the version page.

GPT Sol
GPT Terra
GPT Luna
GPT
5.6 - Jun 265.65.6 - Jun 265.65.6 - Jun 265.64 - Mar 1444 Turbo - Nov 64 Turbo4o - May 134oo1-preview - Sep 12o1-previewo1 - Dec 5o154.5 - Feb 27 4.1 - Apr 14 o3 - Apr 16 o3-pro - Jun 10 5 - Aug 7 Expand to show separately5 releases45.3 Codex - Feb 5 5.3 Codex Spark - Feb 13 5.4 - Mar 6 5.5 - Apr 23 Expand to show separately4 releases2023 Q12023 Q22023 Q32023 Q42024 Q12024 Q22024 Q32024 Q42025 Q12025 Q22025 Q32025 Q42026 Q12026 Q22026 Q3

Models

GPT

AI Model

Released

Latest: 5.5

OpenAI's flagship large language model series.

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GPT Sol

AI Model

Released

Latest: 5.6

OpenAI's flagship frontier tier in the durable Sol/Terra/Luna family: strongest coding, science, and cybersecurity capabilities at the top of each generation.

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GPT Terra

AI Model

Released

Latest: 5.6

OpenAI's balanced tier for everyday knowledge work and agentic tasks, positioned between Sol and Luna on intelligence, speed, and cost.

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GPT Luna

AI Model

Released

Latest: 5.6

OpenAI's fast, affordable tier in the Sol/Terra/Luna family: strong everyday capability at the lowest API pricing in the GPT 5.6 generation.

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