The Permanent Sunset of Claude Sonnet 4.5: A Paradigm Shift in Anthropic’s Model Lifecycle Technology The Permanent Sunset of Claude Sonnet 4.5: A Paradigm Shift in Anthropic’s Model Lifecycle Do Son May 28, 2026 0 Anthropic inaugurated the Claude Sonnet 4.5 architecture on September 29, 2025. At its inception, the firm heralded... Read More Read more about The Permanent Sunset of Claude Sonnet 4.5: A Paradigm Shift in Anthropic’s Model Lifecycle
