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Claude Haiku 4.5

Anthropic, 15 Oct 2025.

Lab

Anthropic

Released

15 Oct 2025

Kind

Language, Chat

Training compute

Not disclosed

Parameters

Not disclosed

Capability index

142.4 (Epoch)

Organisations

Anthropic

Country

United States

See it in the 3D sky Paper or announcement

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