DeepSeek's rapid iteration in its V4 model family drives trader focus on the next Flash release. The company launched DeepSeek-V4.1-Flash on September 10, 2026, introducing a Causal Encoder-Decoder MoE architecture with a 552B backbone, native multimodal input, 1M-token context, and MIT-licensed open weights that delivered stronger agentic benchmarks than the prior V4-Pro at lower cost and higher throughput. This replaced the July 2026 V4-Flash update and briefly rerouted V4-Pro traffic before that larger model resumed separate service. DeepSeek has averaged releases every 20–60 days recently, with no confirmed timeline or preview for V4.1-Pro or a follow-on Flash variant as of mid-October 2026. Key watchpoints include official API changelogs, benchmark updates, or partner integrations that could signal the next efficiency-focused model.