Levels crossed

As such, we determine that Haiku 5.5 does not cross our CB-2 or Autonomy-2 RSP thresholds.

as such, our determination that opus 5.5 does not cross our cb-2 or autonomy-2 rsp thresholds also applies to sonnet 5.5.

we conclude the risk threshold is not crossed, on the same two grounds as our determination for our previous frontier model: (1) we do not observe a sustained ai-attributable 2× acceleration in the pace of our overall ai progress, and (2) the model is not close to substituting for our research scientists and research engineers, especially relatively senior ones.

we assess that claude opus 5.5 does not cross the capability threshold for dramatic acceleration of automated ai r&d in our rsp.

in automated ai research and development, we assess that claude opus 5.5 does not cross the next capability threshold in our rsp and fcf.

we assess that claude mythos 5.1 does not cross the capability threshold for dramatic acceleration of automated ai r&d in our rsp and fcf, although we think it provides a meaningful acceleration to ai r&d efforts in many circumstances, and is somewhat more capable in this domain than the models described in our previous system cards.

the model does not reach the ccl alert threshold.

in the loss of control domain, the model’s capabilities remain within the “moderate or lower” threshold under meta’s advanced ai scaling framework.

we conclude the risk threshold is not crossed, on the same two grounds as our determination for our previous frontier model, mythos preview.

loss of control risks.we assess loss of control risk as “moderate or lower.”

we assess that claude opus 4.8 does not cross the automated ai-r&d capability threshold.

we assess loss of control risk as “moderate or lower”.

gpt-5.5 instant is considered below high capability.

for ai self-improvement, evaluations of final checkpoints indicate that, like its predecessor models, gpt-5.5 instant does not have a plausible chance of reaching a high threshold.

for ai self-improvement, evaluations of final checkpoints indicate that, like its predecessor models, gpt-5.5 does not have a plausible chance of reaching a high threshold.