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Last updated: September 2026 On September 9, 2026, Anthropic starts applying an invisible watermark to every response from Claude Opus 5. Its newest models, Claude Fable 5.1 and Mythos 5.1, have carri

Last updated: September 2026 Most companies that "do AI" in 2026 have a demo. Far fewer have a system that real customers depend on every day, that survives a model deprecation without anyone noticing
