# Better default outcomes with Claude Sonnet 4.5 as the standard model

> Claude-based agents now default to Claude Sonnet 4.5, improving baseline reasoning quality and response consistency without any configuration changes.

- Published: 2025-10-07
- Author: Agno Team
- Category: Changelog
- Canonical: https://agno-com-nine.vercel.app/articles/better-default-outcomes-with-claude-sonnet-4-5-as-the-standard-model
- Markdown: https://agno-com-nine.vercel.app/articles/better-default-outcomes-with-claude-sonnet-4-5-as-the-standard-model.md

Claude-based agents now default to Claude Sonnet 4.5, improving baseline reasoning quality and response consistency without any configuration changes. This upgrade delivers better out-of-the-box performance while remaining fully configurable if you need to pin an earlier model for reproducibility.

**Details**

- Improved default quality and tool-use reliability
- No code changes required; override the model if you need prior behavior

**Who this is for:** Teams using Anthropic models who want better results by default.