Checked fact 128613 Oct 2026Safety and security

The post says that in Anthropic's own test a pretrained Claude model trained on full reasoning transcripts from Claude Opus 4.8 scored 80.4% on SWE-bench Verified, against 71.8% when trained on summarised transcripts.

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We tested how well a pretrained Claude model performed on the SWE-bench Verified coding benchmark after it was trained on transcripts from Claude Opus 4.8. When training on the full transcripts, the distilled model achieved 80.4%; with only the summarized transcripts, it achieved 71.8%.

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Strengthening our defenses against distillation attacks
Anthropic · 2026-10-12

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Checked by the notis newsroom on 13 Oct 2026, against the source above.

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Anthropic says new safeguards cut distillers' extraction of reasoning tokens 13 Oct 2026

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“The post says that in Anthropic's own test a pretrained Claude model trained on full reasoning transcripts from Claude Opus 4.8 scored 80.4% on SWE-bench Verified, against 71.8% when trained on summarised transcripts.” ai notis, checked 13 Oct 2026. Source: Strengthening our defenses against distillation attacks (Anthropic). https://ainotis.com/c/1286

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ai notis. (2026, October 13). The post says that in Anthropic's own test a pretrained Claude model trained on full reasoning transcripts from Claude Opus 4.8 scored 80.4% on SWE-bench Verified, against 71.8% when trained on summarised transcripts [Checked claim 1286]. ai notis. https://ainotis.com/c/1286

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