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September 29, 2025 Now Using Claude Sonnet 4.5 Anthropic released an updated Sonnet 4.5, and Amp now uses it by default

溯源：Amp Chronicle

We've switched Amp's primary model to Claude Sonnet 4.5, the latest release from Anthropic.

In our testing of Sonnet 4.5 in Amp, we found noticeable improvements for coding, including:

  • Reduced sycophancy
  • Higher success rates for file edits
  • Improved reasoning during complex tasks like debugging

The switch is automatic. Update to the latest release of Amp's VS Code extension or CLI to start using Claude Sonnet 4.5.