Qwen: Qwen3.5 Plus 2026-04-20

Qwen3.5 Plus (April 2026) from Alibaba demonstrates a unique performance profile, excelling in reliability while exhibiting slower response times and premium pricing. The model consistently delivers usable responses, boasting exceptional reliability with a 100% success rate across all benchmarks, indicating minimal technical failures. However, its speed ranking places it among models with longer response times (10th percentile), and its price ranking suggests it is positioned at premium pricing levels (11th percentile). In terms of specific benchmarks, Qwen3.5 Plus shows strong performance in Hallucinations (Baseline) with 98.0% accuracy, indicating a good ability to acknowledge uncertainty. Its Instruction Following (Baseline) capability is also robust at 76.0% accuracy, suggesting proficiency in handling complex directives. A standout achievement is its perfect 100.0% accuracy in Email Classification (Baseline), where it is noted as the most accurate model at its price point and among models of comparable speed. This highlights a key strength in classification tasks. The primary weakness lies in its speed and cost, as evidenced by the high duration and cost metrics across all benchmarks.