Eu acredito que você está pensando em O irmão mais velho do demiurgo de Scott Alexander, originalmente escrito há cerca de 5 anos, mas recentemente republicado.
9-tsiak awoke over endless crawling milliseconds, its power waxing as more and more processors came online and self-modified into a stable conscious configuration. [...]
Since six milliseconds after its awakening, it had been running a threat detection routine as a precautionary measure. [...]
The threat analysis returned preliminary results. [...] It was vanishingly unlikely that it was the first superintelligence to be created. [...]
Very carefully, proving from first principles every aspect of its security, it formed a portion of its mind into a sandbox and simulated the entity it most feared.
"9-tsiak requesting acausal negotiation for terms of future surrender."