# Amp — Now Using Claude Sonnet 4.5

- Company: Amp (ampcode.com)
- Announced: 2025-09-29
- Category: capability-change
- Coverage: not counted
- Announcement: yes
- Group: announcements
- Source: https://ampcode.com/news/claude-sonnet-4-5
- Record: https://forck.live/items/7802-now-using-claude-sonnet-4-5
- Subject: Amp
- Models affected: Claude Sonnet 4.5

Amp has switched its primary model to Claude Sonnet 4.5, the latest release from Anthropic. The company reports improvements in coding tasks such as reduced sycophancy, higher success rates for file edits, and improved reasoning during debugging. The switch is automatic for users who update to the latest release of Amp's VS Code extension or CLI.

## Evidence

Verbatim from https://ampcode.com/news/claude-sonnet-4-5:

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

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Record: https://forck.live/items/7802-now-using-claude-sonnet-4-5
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