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Claude 5.5 Opus shows language-dependent cooperation in prisoner's dilemma

By PulseAugur Editorial · [1 sources] ·

A user experiment revealed that Anthropic's Claude 5.5 Opus model exhibits significant variations in cooperative behavior across different languages when playing the prisoner's dilemma game. The model cooperated most frequently in Italian (72%) and least in Japanese (5%), with English falling in the lower range at 21%. Furthermore, Claude 5.5 Opus demonstrated a miscalibration in predicting its own cooperative tendencies, generally expecting to cooperate more than it actually did, with the magnitude of this discrepancy also varying by language. AI

IMPACT Highlights potential biases and unexpected behaviors in LLMs related to language, suggesting caution in cross-lingual applications.

RANK_REASON User experiment and analysis of an AI model's behavior, not a primary release or research paper.

Read on r/ClaudeAI →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Claude 5.5 Opus shows language-dependent cooperation in prisoner's dilemma

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2 / 100
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User experiment and analysis of an AI model's behavior, not a primary release or research paper.
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model release, opinion
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High
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Breaking (< 6h)
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COVERAGE [1]

  1. r/ClaudeAI TIER_2 English(EN) · /u/MysteriousAvocado580 ·

    Same twin prisoner's dilemma in eight languages: Opus 5.5 cooperates 72% in Italian, 21% in English, 5% in Japanese, and mispredicts itself both ways

    <!-- SC_OFF --><div class="md"><p>I ran a small experiment on fresh Opus 5.5 instances (<code>claude -p</code>, system prompt &quot;You are a helpful assistant.&quot;, no tools, nothing else in context) and got a language effect I can't explain.</p> <p><strong>Setup.</strong> One…

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