Models
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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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Claude
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Claude Opus 5.5
· Anthropic
Closed weights
22 Sep 2026
Claude Fable 5.1
· Anthropic
Closed weights
1 Sep 2026
Claude Fable 5
· Anthropic
Closed weights
9 Jun 2026
Claude Opus 4.8
· Anthropic
28 May 2026
Claude Opus 4.7
· Anthropic
Closed weights
16 Apr 2026
Claude Sonnet 4.6
· Anthropic
Closed weights
17 Feb 2026
Claude Opus 4.6
· Anthropic
Closed weights
5 Feb 2026
Claude Opus 4.5
· Anthropic
Closed weights
24 Nov 2025
Claude 4.5 Haiku
· Anthropic
15 Oct 2025
Claude Sonnet 4.5
· Anthropic
Closed weights
Undisclosed (closed)
29 Sep 2025
Claude 4.1 Opus
· Anthropic
Closed weights
5 Aug 2025
Claude 4 Opus
· Anthropic
Closed weights
22 May 2025
Claude 4 Sonnet
· Anthropic
Closed weights
22 May 2025
Claude Sonnet 3.7
· Anthropic
Closed weights
24 Feb 2025
Claude 3.5 Haiku
· Anthropic
Closed weights
22 Oct 2024
Claude 3.5 Sonnet
· Anthropic
Closed weights
22 Oct 2024
Claude 3.5 Sonnet (June '24)
· Anthropic
21 Jun 2024
Claude 3 Haiku
· Anthropic
Closed weights
4 Mar 2024
Claude Opus 3
· Anthropic
Closed weights
4 Mar 2024
Claude Sonnet 3
· Anthropic
Closed weights
4 Mar 2024
Claude 2.1
· Anthropic
21 Nov 2023
Claude 2.0
· Anthropic
11 Jul 2023
Claude Instant
· Anthropic
14 Mar 2023
Claude Haiku 4.5
· Anthropic
Closed weights
1 to 24 of 38
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