overview changedmodels/sonnet-4-5/overview
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77**Legacy.** Released September 29, 2025.
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9Although Claude Sonnet 4.5 is still available, you should consider migrating to Claude Sonnet 5 for improved performance. [See Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) · [Migrate to Claude Sonnet 5](https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-sonnet-45)
9Although Claude Sonnet 4.5 is still available, you should consider migrating to Claude Sonnet 5 for improved performance. [See Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) · [Migrate to Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-sonnet-45)
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1111Model ID: `claude-sonnet-4-5-20250929`
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8080## Resources
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8282<CardGroup cols={3}>
83 <Card title="Migrate to Claude Sonnet 5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/about-claude/models/migration-guide#migrating-from-sonnet-45">
83 <Card title="Migrate to Claude Sonnet 5" icon="arrows-left-right" href="https://platform.claude.com/docs/en/models/sonnet-5/migration-guide#migrating-from-sonnet-45">
8484 What changes when moving from Claude Sonnet 4.5 and earlier Sonnet models to Claude Sonnet 5.
8585 </Card>
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