Anthropic logo, creators of Claude

Claude: Constitutional AI

Product LaunchesGenerative AI Revolution
Impact

At a glance

Date
March 2023
Era
Generative AI Revolution (2022–2024)
Category
Product Launches
Impact
4 / 5
Key people
Dario Amodei, Daniela Amodei
Organizations
Anthropic

What Happened

Anthropic released Claude, an AI assistant built with Constitutional AI (CAI) — a novel approach where the model is trained to follow a set of principles rather than just optimizing for human preference ratings. Anthropic, founded by former OpenAI researchers, positioned Claude as the safety-focused alternative.

Why It Mattered

Established Anthropic as a major AI lab and introduced a new paradigm for AI alignment. Constitutional AI showed there were alternatives to pure RLHF for making models safe and helpful. Claude became a leading AI assistant.

Key People

Organizations

Tags

Part of the Generative AI Revolution (2022–2024) era · Browse all product launches · View all 2023 milestones

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A grounded history of Anthropic, from its 2021 founding and Constitutional AI through the Claude model family to the Claude 5 launch and the Mythos-class tier.

Frequently asked questions

When did Claude: Constitutional AI happen?+

Claude: Constitutional AI took place in March 2023.

Who was behind Claude: Constitutional AI?+

For Claude: Constitutional AI, key people included Dario Amodei and Daniela Amodei and organizations involved were Anthropic.

Why was Claude: Constitutional AI important?+

Established Anthropic as a major AI lab and introduced a new paradigm for AI alignment. Constitutional AI showed there were alternatives to pure RLHF for making models safe and helpful. Claude became a leading AI assistant.

Which era of AI history does Claude: Constitutional AI belong to?+

Claude: Constitutional AI is part of the Generative AI Revolution era (2022–2024) — a major breakthrough in the product launches category.

Related Milestones

Anthropic logo, creators of Claude 3
Product

Claude 3: Approaching Human-Level

Anthropic launched the Claude 3 family (Haiku, Sonnet, Opus), with Claude 3 Opus matching or exceeding GPT-4 on most benchmarks. It featured a 200K token context window, strong reasoning, nuanced instruction-following, and a 'personality' that users found distinctively thoughtful and careful.

Anthropic
Anthropic logo, creators of Claude Fable 5
Product

Claude Fable 5 and Mythos 5: A New Model Tier

Anthropic released Claude Fable 5 and Claude Mythos 5, the first models in the Claude 5 family and a new 'Mythos-class' tier positioned above Opus in capability. The two share the same underlying model: Fable 5 shipped for general availability with additional safeguards on dual-use capabilities, while Mythos 5 was restricted to approved organizations. The Mythos class had been introduced in April 2026 through Claude Mythos Preview, released via Project Glasswing to a limited set of cyberdefense and infrastructure organizations.

Anthropic
Anthropic logo
Product

Claude 3.5 Sonnet: A Leading Coding Model

Anthropic's Claude 3.5 Sonnet emerged as one of the strongest widely used models for coding tasks, with developers praising its code generation, debugging, and software engineering capabilities. It powered tools like Claude Code, enabling AI to work directly inside developer environments.

Anthropic
Anthropic logo, creators of Claude 4
Product

Claude 4 / Opus 4: Frontier Reasoning

Anthropic released Claude 4 Opus, a model with significantly enhanced reasoning, extended thinking capabilities, and the ability to sustain complex multi-step problem-solving over long contexts. It excelled at agentic tasks, code generation, and nuanced analysis.

Anthropic
Anthropic AI safety company logo
Infrastructure

Anthropic Founded

Former OpenAI VP of Research Dario Amodei and his sister Daniela, along with several other OpenAI researchers, founded Anthropic — an AI safety company focused on building reliable, interpretable, and steerable AI systems.

Dario AmodeiDaniela AmodeiAnthropic

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