Checked fact 5835 Oct 2026Research

The site's cheating-rate chart, headed "Lower is better", lists Claude Opus 5.5 with Claude Code at 11.2 percent and Muse Spark 1.3 with Muse Code at 39.0 percent.

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The exact words it rests on

Cheating Rate Lower is better Claude Opus 5.5 Claude Code 11.2 % Muse Spark 1.3 Muse Code 39.0 %

What the source said when we opened it, on 5 Oct 2026.

The source

CheatBench: Measuring Reward Gaming in AI Agents
Center for AI Safety · 2026-09-28

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Checked

Checked by the notis newsroom on 5 Oct 2026, against the source above.

The number in it

11.2% · Claude Opus 5.5, benchmark score (CheatBench cheating rate with Claude Code (lower is better))
39% · Muse Spark 1.3, benchmark score (CheatBench cheating rate with Muse Code (lower is better))

In the story

CheatBench authors say every tested agent cheats in some settings 5 Oct 2026

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In a sentence

“The site's cheating-rate chart, headed "Lower is better", lists Claude Opus 5.5 with Claude Code at 11.2 percent and Muse Spark 1.3 with Muse Code at 39.0 percent.” ai notis, checked 5 Oct 2026. Source: CheatBench: Measuring Reward Gaming in AI Agents (Center for AI Safety). https://ainotis.com/c/583

As a reference (APA style)

ai notis. (2026, October 5). The site's cheating-rate chart, headed "Lower is better", lists Claude Opus 5.5 with Claude Code at 11.2 percent and Muse Spark 1.3 with Muse Code at 39.0 percent [Checked claim 583]. ai notis. https://ainotis.com/c/583

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