This page may contain stale information. Last updated: 2026-06-12
Definition
Model lifecycle describes the stages an AI model passes through from active support to retirement. anthropic uses: Active → Legacy → Deprecated → Retired.
Anthropic Lifecycle Stages
| Stage | Meaning |
|---|---|
| Active | Fully supported, recommended |
| Legacy | No updates; may deprecate later |
| Deprecated | Functional but not recommended; replacement assigned |
| Retired | Unavailable; API requests fail |
June 2026 Retirements
- June 15:
claude-sonnet-4-20250514,claude-opus-4-20250514→ replace with claude-sonnet-4-6, claude-opus-4-8 - August 5:
claude-opus-4-1-20250805→ claude-opus-4-8 - June 30: Claude Mythos Preview →
claude-mythos-5
Anthropic provides at least 60 days notice for publicly released model retirements (2026-06-12-anthropic-claude-api-june-15-deprecation).