Summary of METR's predeployment evaluation of Claude Opus 5.5

METR's summary of its predeployment evaluation of Claude Opus 5.5. The companion cites it for one fact: by September 2026 METR reported no time horizon for the newest models. It is the latest point in the capability trends that the argument needs to continue (§1).

Cited in

the companion paper (Companion §1)

Used for

Capability trends (§1)

Strand

AI safety, alignment & autonomy evaluations · Autonomy, replication & dangerous-capability evaluations

Cite

@techreport{metr2026opus55,
  title = {Summary of METR's predeployment evaluation of Claude Opus 5.5},
  author = {METR},
  year = {2026},
  howpublished = {METR blog},
  url = {https://metr.org/blog/2026-09-22-claude-opus-5-5/},
}