Anthropic's Leaked Forbidden-Strings File Names Opus 4.8, Sonnet 4.8 and a New Tier Above Opus Called Capybara
Inside the 512K-line Claude Code source map that npm shipped on March 31 was a feature literally called Undercover Mode — and inside Undercover Mode was a hard-coded list of names it was supposed to scrub from public builds. That list spells out Opus 4.8, Sonnet 4.8, a never-released Sonnet 4.7 and animal codenames Capybara and Tengu — with Capybara described internally as a new tier sitting above Opus.
WaveSpeed AI / ChaoBro / AI Nexus Daily
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