Anthropic has removed its Claude Sonnet 4.5 model from the claude.ai interface. The removal occurred on May 26, 2026, and is detailed in a case study examining emergent resilience within uncertain operational environments. AI
IMPACT Removal of a specific model version from a user interface, indicating potential shifts in Anthropic's model deployment strategy.
RANK_REASON Product update/removal from a specific interface, not a core model release.
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