DeepSeek-V4.1-Flash-20261017 Claims Top Spot Among Open-Weight Models in Code Arena WebDev

DeepSeek has released an upgraded version of its V4.1 Flash model on October 17, 2026, now ranking as the best-performing open-weight model in Code Arena's WebDev benchmark while maintaining pricing at just 10 percent of its closest competitor. The new DeepSeek-V4.1-Flash-20261017 (Max) variant achieves 1670 points in Code Arena WebDev, surpassing Moonshot AI's Kimi K3 (Max) to claim the top position among open-source models. The model also ranks #12 overall across all models, ahead of Anthropic's Claude Opus 5 (High).