claude-sonnet-4-5-20250929

claude-sonnet-4-5-20250929 (Anthropic) shuts down Nov 30, 2026 (in 38 days). Anthropic recommends claude-sonnet-5-5 instead.

Provider

Anthropic

Shutdown

Nov 30, 2026 (in 38 days)

Announced

Sep 30, 2026

Replace with

claude-sonnet-5-5

Also written as

claude-sonnet-4-5

• Alias->snapshot mapping from archived official Anthropic models overview (https://web.archive.org/web/20251119121442/https://docs.claude.com/en/docs/about-claude/models/overview ; https://web.archive.org/web/20250303051919/https://docs.anthropic.com/en/docs/about-claude/models/all-models ; https://web.archive.org/web/20260105042128/https://platform.claude.com/docs/en/about-claude/models/overview). The alias resolves to this dated snapshot; Anthropic has not published any repointing, so it is treated as retired with the snapshot.
• Dates apply to Anthropic-operated platforms (Claude API, Claude Platform on AWS, Claude on Google Cloud (Anthropic managed), Microsoft Foundry). Bedrock and Vertex AI (Google managed) set their own dates - see provider aws-bedrock / vertex-ai.

Source: https://platform.claude.com/docs/en/about-claude/model-deprecations · report a wrong date