DeepSeek V4 Flash 0731 open weights released, outperforms flagship

DeepSeek-V4-Flash-0731, a 284B-parameter MoE model, scores 82.7 on Terminal-Bench 2.1, beating V4 Pro Preview's 72.1 despite fewer parameters. Priced near 2 cents per million input tokens, it jumped from 7% to 54% on DeepSweep agentic coding benchmark via post-training.