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Security Harvester Security Harvester @secharvester · 9.99K subscribers
Post #23462 169
I flooded a legal contract with lookalike letters and gave it to seven GPT and Claude models. None were fooled, but it took up to 5.7x the tokens to read, and the bill for each question rose by up to 3.9x. 'Denial of Spend'
https://paultendo.github.io/posts/denial-of-spend-gpt-6-claude-fable/

@secharvester
paultendo.github.io Lookalike letters don’t fool GPT-6 or Claude, but nearly quadruple the bill I reran my Denial of Spend test on GPT-6 Astra, Sol and Luna and Claude Fable 5.1, Opus 5.5, Sonnet 5 and Haiku 4.5. None were fooled by lookalike letters, and all of them still paid to read them: up to 5.7x the tokens and up to 3.9x the bill.
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