Why we can't have nice things! ...Or can we?
On 7th April 2026, Anthropic published a system card for an AI model we may never be allowed to use: Claude Mythos. This preview demonstrated a significant leap in capability over Anthropic’s previous Claude Model (Opus 4.6), and their Responsible Scaling Policy (RSP) v3.1 led to them making the decision to withhold it from general availability, serving as a "defensive only" asset.