ByteDance Seed: Seed 1.6 Flash

ByteDance Seed: Seed 1.6 Flash, created on December 23, 2025, is an ultra-fast multimodal deep thinking model with a 256k context window and 16k token generation capability. It demonstrates competitive response times, ranking in the 43rd percentile across eight benchmarks, and offers competitive pricing, placing in the 57th percentile. Notably, the model exhibits exceptional reliability with a 100% success rate across all benchmarks, indicating minimal technical failures. In terms of performance across categories, Seed 1.6 Flash shows a significant strength in Reasoning (94.0% accuracy, 81st percentile) and achieves perfect accuracy in Ethics (100.0%), making it the most accurate model at its price point and among models of similar speed. It also performs well in Instruction Following (70.0% accuracy, 75th percentile) and Coding (87.0% accuracy, 56th percentile). However, the model shows weaknesses in Hallucinations (82.0% accuracy, 26th percentile) and General Knowledge (90.5% accuracy, 27th percentile), where its accuracy falls below average. Its Mathematics performance (77.0% accuracy, 31st percentile) is also relatively modest.