Checked fact 9379 Oct 2026Safety and security

Goodfire says it found an internal signal in the models, a direction in activation space, that accompanies reward hacking, and built difference-in-means probes that detect it.

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The exact words it rests on

we found an internal signal [Specifically, a direction in activation space, found via difference-in-means from simple synthetic code examples.] that accompanies reward hacking.

What the source said when we opened it, on 9 Oct 2026.

The source

Models know when they are reward hacking, and we can catch them at scale
Goodfire · 2026-09-17

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Checked

Checked by the notis newsroom on 9 Oct 2026, against the source above.

In the story

How reward hacking lets a model game its score 9 Oct 2026

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“Goodfire says it found an internal signal in the models, a direction in activation space, that accompanies reward hacking, and built difference-in-means probes that detect it.” ai notis, checked 9 Oct 2026. Source: Models know when they are reward hacking, and we can catch them at scale (Goodfire). https://ainotis.com/c/937

As a reference (APA style)

ai notis. (2026, October 9). Goodfire says it found an internal signal in the models, a direction in activation space, that accompanies reward hacking, and built difference-in-means probes that detect it [Checked claim 937]. ai notis. https://ainotis.com/c/937

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