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Since Anthropic publish their system prompts we can generate a diff between Claude Opus 4.6 and 4.7 - here are my notes on what's changed simonwillison.net/2026/Apr/18/op…↗

·@simonw·Apr 19, 2026·media·anthropic·claude-opus-4-6·claude-opus-4-7·claude-system-prompt

We released Claude Opus 4.6 just two months ago. Today we're sharing some info on our new model, Claude Mythos Preview.↗

·@alexalbert__·Apr 7, 2026·tool·claude-mythos-preview·claude-opus-4-6·model-release