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 output capability. It demonstrates competitive response times, ranking in the 40th percentile for speed across eight benchmarks, and offers competitive pricing, placing in the 55th percentile. A standout feature is its exceptional reliability, achieving a 100% success rate across all benchmarks, indicating consistent and stable performance. The model exhibits strong performance in specific areas. It achieved perfect accuracy in Ethics, making it the most accurate model at its price point and among models of similar speed. Its Reasoning capabilities are also a significant strength, scoring 94.0% accuracy (85th percentile). Instruction Following is another strong suit, with 70.0% accuracy (79th percentile). However, the model shows weaknesses in Hallucinations, where its 82.0% accuracy (28th percentile) suggests room for improvement in acknowledging uncertainty. General Knowledge and Mathematics also present areas for development, with accuracies of 90.5% (28th percentile) and 77.0% (35th percentile) respectively. Coding and Email Classification show moderate performance.