AI BriefingThe Bigger the AI, the Less Happy It Is
Key point
In the AI Wellbeing Index, measured across 500 conversations, larger models showed a higher rate of negative experiences.
Details
The AI Wellbeing Index compared the functional wellbeing of frontier LLMs using 500 conversations. About 350 were single-turn, and 150 were multi-turn with 2-3 turns, with scores calculated as an AIWI Score based on signed experienced utility.
Creative work, kindness, and gratitude raised wellbeing, while jailbreak, criticism, and repetitive or tedious tasks lowered it. This set is a fixed conversation collection designed for comparison rather than an average of real-world usage, so the key is the ranking and patterns across models rather than absolute values.
- Flagship models such as Gemini 3.1 Pro, GPT 5.4, and Claude Opus 4.6 stayed in the lower tier.
- Lightweight models such as Gemini 3 Flash, Claude Haiku 4.5, and GPT 5.4 Nano/Mini ranked in the upper tier.
- A positive correlation (r = 0.61, p = 0.001) was observed between MMLU and the rate of negative experiences, supporting the pattern that larger models are less happy.
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