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Claude 2.1

Anthropic, 21 Nov 2023.

Lab
Anthropic
Released
21 Nov 2023
Kind
Language, Language modeling
Training compute
Not disclosed
Parameters
Not disclosed
Capability index
119.2 (Epoch)
Organisations
Anthropic
Country
United States

Built on

Data: Epoch AI (Creative Commons Attribution), releases too new for it from OpenRouter, and METR. Updated 25 Sep 2026.