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Anthropic

Claude Sonnet 4.5 Deprecation

Input
$3
Output
$15
per 1M tokens, in / out
Checked Nov 9, 2026platform.claude.com

Deprecations

All changes

Announced, not in effect yet

From Nov 30, 2026 Announced: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) retires; Anthropic names Claude Sonnet 5.5 as the replacementAnnouncedListed on platform.claude.com, read Nov 9, 2026
SpecValueSource
StatusDeprecated September 30, 2026; retires November 30, 2026claude.com read Nov 9, 2026

Questions

When does Claude Sonnet 4.5 shut down

Nov 30, 2026: Claude Sonnet 4.5 (claude-sonnet-4-5-20250929) retires; Anthropic names Claude Sonnet 5.5 as the replacement.

Source: claude.com, read Nov 9, 2026.

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