"We also made use of an additional source of information which

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"We also made use of an additional source of information which we are not able to disclose at this time" https://x.com/theojaffee/status/21024875…

Andrew Curran@AndrewCurran_3h ago

This is interesting, buried in the Opus 5.5 system card: METR used 'an additional source of information' which they are not able to disclose at this time to understand AI research and development at Anthropic.