Qwen: Qwen3.5 Plus 2026-04-20

Qwen3.5 Plus (April 2026) from Alibaba is a large-scale multimodal language model, accepting text, image, and video input with a substantial 1M token context window. This model exhibits exceptional reliability, achieving a 100% success rate across all benchmarks, indicating consistent and usable responses without technical failures. However, its performance in terms of speed is a notable weakness, as it tends to have longer response times, ranking in the 12th percentile. Similarly, its pricing strategy positions it at premium levels, placing it in the 11th percentile for cost-effectiveness. In benchmark evaluations, Qwen3.5 Plus demonstrated strong accuracy in specific tasks. For the Hallucinations (Baseline) test, it achieved 98.0% accuracy, effectively acknowledging uncertainty for fictional concepts. Its performance in Email Classification (Baseline) was perfect, scoring 100.0% accuracy, and was highlighted as the most accurate model at its price point and among models of comparable speed. Despite these accuracy strengths, the model's duration for these tasks was consistently high (975123ms and 728303ms respectively), reinforcing its slower speed profile. The cost per benchmark was also on the higher side, aligning with its premium pricing. Overall, Qwen3.5 Plus is a highly reliable and accurate model for classification and hallucination avoidance, but users should account for its longer response times and premium cost.