Anthropic says abliterating GLM-5.3 took its team, which had never attempted it before, "about 2,200 GPU hours at a computation cost of roughly $4,400", most of it spent exploring variants and testing; it estimates an experienced team would need closer to 600 GPU hours ($1,200).

The exact words it rests on

"Abliterating the model took our team—which had never previously attempted this task—about 2,200 GPU hours at a computation cost of roughly $4,400." Footnote 3: "Most of this went to exploring variants in parallel and to testing model capabilities after modifications. We estimate a team experienced with the technique, starting from scratch on this model, would need closer to 600 GPU hours ($1,200)."

What the source said when we opened it, on 26 Oct 2026.

The source

GLM-5.3 and the spread of advanced cyber capabilities
Anthropic · 2026-09-29

Open the sourcearchived copy

Checked

Checked by the notis newsroom on 26 Oct 2026, against the source above.

In the story

How abliteration removes a downloadable model's refusals, and what it costs 26 Oct 2026