DeepSeek V4.1 Flash Achieves Major Cost-Performance Breakthrough Against Claude Opus 5.5
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DeepSeek has released evidence that its lightweight V4.1 Flash model substantially undercuts Claude Opus 5.5 on cost while maintaining competitive real-world task performance. The Chinese AI lab's latest update to V4.1 Flash, released in October 2026, demonstrates a dramatic shift in the cost-performance frontier for production AI applications.
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