Anthropic quietly removed flagship Opus while giving cheap Haiku retirement notice
ModelLifecycle · reddit · 2026-10-28
A Reddit post highlights Anthropic's asymmetric model retirement practices: cheapest Haiku 4.5 gets an advance notice (retiring Oct 29), former flagship Opus 4.5 was silently removed from the model picker months ago, and Opus 3 got a formal retirement yet remains accessible. No published policy explains which model gets which treatment. The author also links a small controlled study (OSF data) showing newer models don't fully replace older ones behaviorally.
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