DeepSeek V4.1 Flash: The Native Multimodal Model That's Breaking Speed Records How DeepSeek Achieved 420 Tokens/Second W...

DeepSeek V4.1 Flash: The Native Multimodal Model That's Breaking Speed Records How DeepSeek Achieved 420 Tokens/Second Without Sacrificing AccuracyPublished: September 9, 2026 | Reading time: 10 minutes The Surprise BetaOn September 8, 2026, DeepSeek quietly launched a beta test for V4.1 Flash, an intermediate model with the identifier deepseek-v4.1-flash-expires-on-0910. The model name itself reveals the urgency—this beta expires on September 10, giving developers just 48 hours to test it.What makes this launch remarkable isn't just the speed. It's that V4.1 Flash is DeepSeek's first native multimodal model, supporting both text and image input/output from the factory, not as an afterthought. Performance BenchmarksTaskSpeed Improvement49K Long Context Retrieval5.2x fasterSVG Code Generation6.0x fasterManacher Palindrome Algorithm4.6x fasterComplex SQL Query Generation5.0x fasterAsyncio Architecture Refactoring3.9x fasterPeak Performance: 420 tokens/second in long-text reasoning tasks,...