DeepSeek V4.1 Flash to Launch September 10, Outperforms V4 Pro at Lower Cost

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DeepSeek is set to officially release its V4.1 Flash model on September 10, 2026, at 12:00 Beijing Time. According to the company, V4.1 Flash surpasses the existing V4 Pro across all key benchmarks, including performance, speed, and task completion. Following the launch, all requests directed to the Pro model will be automatically rerouted to V4.1 Flash and billed at the lower Flash pricing. Off-peak input and output prices are set at $0.003 for cache hits, $0.15 for cache misses, and $0.60 for output, with peak-hour rates doubling those figures. The transition will remain in effect until the eventual release of V4.1 Pro.

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