DeepSeek V4.1 Flash matches GPT-6 Astra performance at 1.4% of the cost

OpenDesign Arena tested 13 AI models on web design tasks, finding that DeepSeek V4.1 Flash achieved 98% of the performance of OpenAI's GPT-6 Astra while costing only 1.4% of the price. GPT-6 Astra scored 82.7 points at $1.61 per task, whereas DeepSeek V4.1 Flash scored 81.2 points at $0.023. The model utilizes a Causal Encoder-Decoder architecture, activating only a fraction of its 552 billion parameters to process inputs and generate outputs.