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LLM Stability Varies Wildly: Qwen 3.5 122B Outperforms GPT-5.5, Opus, Gemini

A recent discussion on LessWrong highlights the significant differences in the stability and reliability of various large language models when left to run unattended for extended periods. Models like Anthropic's Opus and Google's Gemini 3-Pro tend to destabilize or cause system issues within hours, while OpenAI's GPT-5.5 lasts longer, and Alibaba's Qwen 3.5 122B demonstrated remarkable stability over 50 agent-weeks. This disparity presents an opportunity for researchers to develop methods for improving AI truthfulness and minimizing unintended side effects, which could be integrated into future frontier models. AI

IMPACT Highlights critical infrastructure stability differences between leading LLMs, impacting operational reliability and cost.

RANK_REASON Discussion post on a forum analyzing model behavior, not a primary release or research paper.

Read on LessWrong (AI tag) →

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

LLM Stability Varies Wildly: Qwen 3.5 122B Outperforms GPT-5.5, Opus, Gemini

COVERAGE [1]

  1. LessWrong (AI tag) TIER_1 English(EN) · lemonhope ·

    The getting is good (optimizing unattended runs)

    <p>What a time to be alive!</p> <p>Some people posted about how to do cheaper better faster vision and it ended up in fable.</p> <p>Some people posted about how to do cheaper better faster speculative decoding and it ended up in grok 4.5.</p> <p>There's currently massive differen…