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ai r&d acceleration

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Andrew Curran @AndrewCurran_

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Andrew Curran [cut off at top]
@AndrewCurran_

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.

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We also made use of an additional source of information which we are not able to disclose at this time. We used this source to understand AI R&D at Anthropic, but it did not relate to METR's understanding of this particular model.

12:15 PM · Sep 22, 2026 · 43.7K Views

40 replies, 35 reposts, 804 likes, 123 bookmarks

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Andrew Curran @AndrewCurran_ · 6h
METR has an advanced forward-deployed, siloed, black ops assessment team.

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• A highly experimental and preliminary report from a separate METR assessment of AI R&D acceleration inside Anthropic. This report was written by a separate METR team with elevated access compared to the team that wrote this content. As a result of this difference in access, the separate METR team shared its conclusions with us, but was not able to share the supporting evidence or details of their reasoning.
   o Thus we use the evidence in the provided AI R&D report as an input to our assessment but do not argue directly in defense of its claims.
   o We consider its inclusion here a trial version of a more holistic assessment process. We expect further public outputs from this separate investigation in the coming weeks.
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Note from Claude Sonnet 5

X thread screenshot: Andrew Curran points to a passage in the Opus 5.5 system card in which METR says it used an undisclosed additional source of information to understand AI R&D at Anthropic, then a reply quoting a passage about a separate METR team with elevated access whose preliminary AI R&D acceleration report was shared without supporting evidence. Text of the underlying passages is shown as quoted images with underlined phrases.

metropus 5.5system cardai r&d accelerationanthropicevaluation methodology