Qwen3.8 Shows Significant Gains via GPT-5.5 Pro Reasoning Prefills
September 9, 2026
Experiments show that inserting the first 1% of GPT-5.5 Pro's reasoning into a model's reasoning channel significantly boosts performance. Qwen3.8 A95B saw the largest improvement, with unigram source recall jumping from 33.92% to 54.50% (+20.58 pp) when using teacher prefills.
HOW THIS AFFECTS YOU
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builderYou can explore reasoning-prefill techniques to improve the logic capabilities of your deployed models.
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researcherThis demonstrates the effectiveness of reasoning-prefill as a method for boosting open-weight model performance.