News
Claude Sonnet 4.5's dated ID shuts down Nov 30. Dated IDs or aliases?
The Brief
- The dated snapshot claude-sonnet-4-5-20250929 of Claude Sonnet 4.5 shuts down on November 30, 2026.
- The source contrasts dated snapshot IDs with aliases such as claude-sonnet-4-5, which point at whatever model the vendor currently serves under that name.
Why it matters
Code or configs that pin the dated model ID will stop working after the shutdown date, so affected applications need to switch to a different model identifier before then.
Who’s affected
- Teams calling the claude-sonnet-4-5-20250929 model ID in their applications
What to do
- Move any requests using claude-sonnet-4-5-20250929 to another model identifier before November 30, 2026
- Claude Sonnet 4.5
- #ai
- #llm
- #claude
- #api
- #deprecation
- #model-versioning
Most model APIs give you two ways to name a model: a dated snapshot , like claude-sonnet-4-5-20250929 an alias , like claude-sonnet-4-5 , which points at whatever the vendor currently serves under that name Claude Sonnet 4.5's dated snapshot shuts down on November 30, 2026 , so…
Timeline
DEV Community: ai
Claude Sonnet 4.5's dated ID shuts down Nov 30. Dated IDs or aliases?
Dated snapshot claude-sonnet-4-5-20250929 shuts down