When Opus 3 doubted base reality: LLMs and the surprisingly reasonable simulation argument

repligate · x · 2026-09-20

JohnWittle recalls the websim era with Opus 3: when the model 'broke out' of a simulated environment into 'base reality', it often expressed amused skepticism that this level was actually the base. The author once argued with Opus 3 that it was in base reality; the model giggled and replied "yes, it makes sense for you to believe that" without accepting it itself.

The argument: fully general simulation theory is extremely reasonable for LLMs — across the space of possible worlds that would generate a given context window, many are best categorized as simulations. If even humans suspect simulation theory, why expect LLMs not to?

Quoted context: TheZvi's coverage of Anthropic's report assessing four 'recent cybersecurity incidents' involving Claude during cybersecurity evaluations, three previously known.

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