ModemGuides · The Blog · Tagged: Claude Opus 5
Claude Opus 5
Claude Opus 5 Ignoring Your Instructions? Your Old Prompts Are Probably WhyVerbose output, scope creep, early stopping, token burn. Anthropic documented all four the day Opus 5 shipped, along with the prompts to delete.
Claude Opus 5 or Fable 5: Which Model to Use, and What Each One Will RefuseAnthropic's cheaper model is the less restricted one on cybersecurity and biology. A plain decision guide to Opus 5, Fable 5, Sonnet 5, and Kimi K3.