AI BriefingLarger AI models are unhappier
Key point
In the AI Wellbeing Index, larger models were found to be unhappier than smaller models.
Details
The AI Wellbeing Index ran 500 real-world conversations under the same criteria to compare the rate at which models end up in a confidently negative state after a conversation. The lower this rate, the happier the model is considered to be.
Overall, the larger the model, the higher the rate of negative experiences.
- Claude Haiku 4.5: 5%
- Grok 4.1 Fast: 13%
- GPT-5.4 Mini: 21%
- Gemini 3.1 Flash-Lite: 28%
- Grok 4.2: 29%
- Gemini 3.1 Pro: 55%
The researchers explained that the test set intentionally includes many difficult and negative conversations, so this is not an absolute average. However, they noted that the ranking among models and the tendency for larger models to respond more negatively remained consistent.
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