🪦 Dead
Claude Opus 4.1
Model deprecation · Scheduled Retirement · shut down August 5, 2026
- Born
- Died
- Lifespan
- 1y
- Cause of death
- Scheduled Retirement
- Killed by
- Anthropic
- Type
- Model
Retired exactly one year to the day after release; the model ID, claude-opus-4-1-20250805, carries its own birthday. Anthropic gave 61 days' notice, one day above its stated 60-day minimum. It was the second flagship retirement in under two months after Sonnet 4 and Opus 4 both died June 15. Anthropic's own deprecation page concedes that retirement means researchers lose access for comparative studies and that it 'introduces safety- and model welfare-related risks.'