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Foundation models and notable fine-tunes - closed frontier and open weights.
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263
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409
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GPT-4.1 Nano
· OpenAI
Closed weights
14 Apr 2025
GPT-4o (March 2025, chatgpt-4o-latest)
· OpenAI
27 Mar 2025
GPT-4.5 (Preview)
· OpenAI
Closed weights
27 Feb 2025
GPT-4o (ChatGPT)
· OpenAI
15 Feb 2025
GPT-4o
· OpenAI
Closed weights
20 Nov 2024
GPT-4o (2024-08-06)
· OpenAI
6 Aug 2024
GPT-4o-mini
· OpenAI
Closed weights
18 Jul 2024
GPT-4o (2024-05-13)
· OpenAI
13 May 2024
GPT-4 Turbo
· OpenAI
Closed weights
6 Nov 2023
GPT-4
· OpenAI
Closed weights
14 Mar 2023
GPT-3.5 Turbo
· OpenAI
Closed weights
30 Nov 2022
InstructGPT
· OpenAI
Closed weights
1.3B, 6B, 175B (text-davinci-001/002 / text-davinci-003)
Jan 2022
OpenAI Codex (2021)
· OpenAI
Closed weights
12B (Codex-12B), with smaller 300M and 2.5B variants reported
Jul 2021
GPT 5.4 Pro
· OpenAI
GPT 5.6 Luna Xhigh (codex Harness)
· OpenAI
Closed weights
GPT 5.6 Sol Xhigh (codex Harness)
· OpenAI
Closed weights
GPT 5.6 Terra Xhigh (codex Harness)
· OpenAI
Closed weights
GPT Image 2.5 Flare
· OpenAI
Closed weights
GPT Image 2.5 Sunburst
· OpenAI
Closed weights
GPT-5 Chat
· OpenAI
Closed weights
GPT-5.2 Chat
· OpenAI
Closed weights
GPT-5.2 Search Non Reasoning
· OpenAI
Closed weights
GPT-5.3 Chat
· OpenAI
Closed weights
GPT-Image 1
· OpenAI
Closed weights
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