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AI research and products that put safety at the frontier

Claude.ai

Meet Claude Opus 4.1

Claude Opus 4.1, our most intelligent AI model, is now available.
Talk to Claude
Talk to Claude
API

Build with Claude

Create AI-powered applications and custom experiences using Claude.
Learn more
Learn more

Claude Opus 4.1 and Sonnet 4

Our most powerful models yet, pushing the frontier for coding and AI agents—and enabling Claude to handle hours of work across Claude and Claude Code.

Read announcement
Read announcement

Model details

Opus 4.1

Learn more Claude Opus 4

Model details

Sonnet 4

Learn more about Sonnet 4

“

Doing biology on these machines made of math

Josh Batson
Research Lead, Interpretability

At Anthropic, we build AI to serve humanity’s long-term well-being.

‍

While no one can foresee every outcome AI will have on society, we do know that designing powerful technologies requires both bold steps forward and intentional pauses to consider the effects.

That’s why we focus on building tools with human benefit at their foundation, like Claude. Through our daily research, policy work, and product design, we aim to show what responsible AI development looks like in practice.

Core Views on AI Safety

Learn more about our views on AI Safety

Anthropic’s Responsible Scaling Policy

Learn more about our Responsible Scaling Policy

Anthropic Academy: Learn to build with Claude

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