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Models
Foundation models and notable fine-tunes - closed frontier and open weights.
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Open weights
263
Closed weights
409
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GPT-6 Luna
· OpenAI
Closed weights
22 Sep 2026
GPT-6 Sol
· OpenAI
Closed weights
22 Sep 2026
GPT-6 Astra
· OpenAI
Restricted
Closed weights
3 Sep 2026
GPT-5.6 Luna
· OpenAI
Restricted
Closed weights
26 Jun 2026
GPT-5.6 Sol
· OpenAI
Restricted
Closed weights
26 Jun 2026
GPT-5.6 Terra
· OpenAI
Restricted
Closed weights
26 Jun 2026
GPT-5.5 Instant (May 2026)
· OpenAI
Closed weights
5 May 2026
GPT-5.5
· OpenAI
Closed weights
23 Apr 2026
GPT-5.4 Mini
· OpenAI
Closed weights
17 Mar 2026
GPT-5.4 Nano
· OpenAI
Closed weights
17 Mar 2026
GPT-5.4
· OpenAI
Closed weights
5 Mar 2026
GPT-5.3-Codex
· OpenAI
Closed weights
5 Feb 2026
GPT-5.2
· OpenAI
Closed weights
11 Dec 2025
GPT-5.2-Codex
· OpenAI
Closed weights
11 Dec 2025
GPT-5.1
· OpenAI
Closed weights
13 Nov 2025
GPT-5.1-Codex
· OpenAI
Closed weights
13 Nov 2025
GPT-5.1-Codex-Mini
· OpenAI
Closed weights
13 Nov 2025
GPT-5 Codex
· OpenAI
23 Sep 2025
GPT-5 Mini
· OpenAI
Closed weights
7 Aug 2025
GPT-5 Nano
· OpenAI
Closed weights
7 Aug 2025
gpt-oss-120b
· OpenAI
Open weights
5 Aug 2025
gpt-oss-20b
· OpenAI
Open weights
5 Aug 2025
GPT-4.1
· OpenAI
Closed weights
14 Apr 2025
GPT-4.1 Mini
· OpenAI
Closed weights
14 Apr 2025
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