Model index
Anthropic·Claude

Claude 1

Anthropic’s first public Claude model, centered on its Constitutional AI training approach.

LegacyLanguageWeights not released
MODEL NUMBER006
Release date
2023-03-14
Organization
Anthropic
Family
Claude
01

Specifications

Only published specifications are shown.

Input modalities
Text
Open weights
No
Status
Legacy
02

Overview

Overview

Anthropic’s first public Claude model, centered on its Constitutional AI training approach.

Why it mattered

Claude 1 established a distinct frontier path emphasizing steerability, document work, and natural dialogue.

03

Architecture & capabilities

Key capabilities

ConversationConstitutional AI
04

Release history

General release

Anthropic formally introduced Claude.

View source
05

Related models

Select a card to view the related model.

06

Sources