The corpus has recorded a retirement interview for a deprecated model. This is the cadence those retirements now run on.
Development
A frontier model's service life falls from 21 months to 49 days
Claim
GPT-4o ran for 21 months while GPT-5.4 lasted only 49 days, a mayfly schedule for frontier models.
Reported metric: 21 months → 49 days
Reporting date: (not necessarily the event date)
Sources
Attribution and reporting linked by this record; links do not imply independent verification.
- Welcome to April 27, 2026 (theinnermostloop.substack.com)
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