DeepSeek-V4.1-Flash DeepSeek-V4.1-Flash
DeepSeek-V4.1-Flash is a high-efficiency, multimodal Mixture-of-Experts model designed specifically for agentic and long-context workloads. It utilizes a novel Causal Encoder-Decoder architecture to optimize compute activation and KV cache memory, offering a 1 million-token context window with open MIT-licensed weights.
Launched September 10, 2026, as the newest model in the architecture family; legacy V4-Flash/V4-Flash-Vision-Exp retired and routed to V4.1-Flash; V4-Pro API requests temporarily route to this model.
As of
- 1 million-token context window with native multimodal vision understanding
- Causal Encoder-Decoder architecture with asymmetric 8B/16B active parameters
- FP4 KV cache compression and SWA Bounded Replay for memory efficiency
- Controllable reasoning effort settings (1-100)
- Open weights released under the MIT License
Input-heavy agentic tasks, large repository code analysis, multimodal document extraction, and high-volume workflows suitable for off-peak scheduling.
Frontier-level scientific reasoning, complex multi-step terminal tasks (where frontier models like Opus-5.0 currently excel), or casual local hardware deployment.
API pricing uses peak/off-peak rates per million tokens. Off-peak: $0.003 (cache hit), $0.15 (cache miss), $0.60 (output). Peak: $0.006 (cache hit), $0.30 (cache miss), $1.20 (output).
An exceptionally cost-efficient, open-weight engine for production agents that dramatically lowers the barrier to entry for long-context, multimodal automation, provided the workload fits its specialized agentic strengths.
Is DeepSeek-V4.1-Flash free?
DeepSeek-V4.1-Flash is Freemium. API pricing uses peak/off-peak rates per million tokens. Off-peak: $0.003 (cache hit), $0.15 (cache miss), $0.60 (output). Peak: $0.006 (cache hit), $0.30 (cache miss), $1.20 (output). Check the official site for current plans.
Is DeepSeek-V4.1-Flash open source?
DeepSeek-V4.1-Flash is not listed as open source on ai.dosa.dev - it is Freemium.
How much does DeepSeek-V4.1-Flash cost?
API pricing uses peak/off-peak rates per million tokens. Off-peak: $0.003 (cache hit), $0.15 (cache miss), $0.60 (output). Peak: $0.006 (cache hit), $0.30 (cache miss), $1.20 (output). Pricing changes often - verify on the official site.
Who is DeepSeek-V4.1-Flash best for?
Input-heavy agentic tasks, large repository code analysis, multimodal document extraction, and high-volume workflows suitable for off-peak scheduling.
Who is DeepSeek-V4.1-Flash not ideal for?
Frontier-level scientific reasoning, complex multi-step terminal tasks (where frontier models like Opus-5.0 currently excel), or casual local hardware deployment.
What are the best DeepSeek-V4.1-Flash alternatives?
The closest DeepSeek-V4.1-Flash alternatives on ai.dosa.dev are Claude, ChatGPT, Gemini - all listed under General-Purpose AI Assistants (with Strong Coding Capability).
Who makes DeepSeek-V4.1-Flash?
DeepSeek-V4.1-Flash is developed by DeepSeek. It is listed in the General-Purpose AI Assistants (with Strong Coding Capability) category on ai.dosa.dev.
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