We announced the deprecation of the Claude Sonnet 4.5 model (claude-sonnet-4-5-20250929), with retirement on the Claude API scheduled for November 30, 2026.

1. 30 Sep 2026 Announced · Claude Platform release notesWe announced the deprecation of the Claude Sonnet 4.5 model (claude-sonnet-4-5-20250929), with retirement on the Claude API scheduled for November 30, 2026.
2. 30 Nov 2026 DeadlineThe date in the announcement

• The legacy Workbench (platform.claude.com/workbench) in the Claude Console is being sunset with access ending on August 17, 2026.17 Aug 2026 · Claude Platform release notes
• We've deprecated fast mode for Claude Opus 4.7, with removal on July 24, 2026.24 Jul 2026 · Claude Platform release notes

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

• Add the deadline to your calendar, with a reminder 30 days before.
• Watch above puts it on My radar, with reminders and changes to it.
• Anthropic Claude RSS feed: retirements, releases and known issues as they are published.
• Lifecycle: every end of support and retirement ahead.