Something
remarkable
has arrived.
Anthropic · June 2025
New Model Release
Claude 4
Sonnet
The most intelligent Claude yet.
What's New
Extended Thinking
Deep, multi-step reasoning for complex problems — from math proofs to legal analysis.
State-of-the-Art Coding
Builds full applications, debugs relentlessly, and understands entire codebases.
Nuanced Understanding
Follows subtle intent. Reads between the lines. Gets what you actually mean.
Built by Anthropic.
Safe at the frontier.
Capable at the core.
Yours to use.
Start building with Claude 4 Sonnet
claude.ai
Available now. Free to start.