DeepSeek's September 10, 2026 release of V4.1-Flash, featuring a new 552B-parameter MoE Causal Encoder-Decoder architecture with native multimodal support, just 8B/16B active parameters, and superior efficiency on agentic benchmarks like Terminal-Bench, has reset expectations for its Flash tier. The model retired prior Flash variants, outperformed the V4 Pro on cost and speed, and prompted routing of Pro traffic to Flash pricing while the company prepares V4.1-Pro. A $12 billion+ Tencent-backed funding round in early October strengthens development capacity amid China's rapid AI model cadence. Traders monitor for V4.1-Pro timelines, potential V5 hints, and any shifts in open-weight licensing or API pricing that could signal the next Flash iteration.