DeepSeek-V4.1-Flash is a high-performance, multimodal Mixture-of-Experts model featuring a novel Causal Encoder-Decoder architecture.
It is specifically optimized for agentic and coding workloads, offering a 1-million-token context window and significantly reduced KV cache requirements.
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Native multimodal visual understanding
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1-million-token context window
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Asymmetric Causal Encoder-Decoder architecture
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Controllable reasoning effort (1-100)
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Open-weight availability under MIT license
Paid
Peak/off-peak model: Off-peak (0.15/1M input cache-miss, 0.003/1M input cache-hit, 0.60/1M output); Peak (0.30/1M input cache-miss, 0.006/1M input cache-hit, 1.20/1M output).
Best for
Agentic coding workflows, long-context document analysis, and multimodal tasks requiring high throughput at low cost.
Not ideal for
General knowledge-intensive reasoning tasks where frontier closed-source models currently lead, or environments with strict data residency requirements in non-Chinese jurisdictions.
A highly efficient, cost-effective model that excels in agentic and coding tasks, making it a top choice for developers prioritizing performance-per-dollar and open-weight portability.
Released in September 2026 as the new flagship, replacing the V4-Pro API path and introducing a more efficient Causal Encoder-Decoder architecture.
As of
Is DeepSeek-V4.1-Flash free?+
DeepSeek-V4.1-Flash is Paid. Peak/off-peak model: Off-peak (0.15/1M input cache-miss, 0.003/1M input cache-hit, 0.60/1M output); Peak (0.30/1M input cache-miss, 0.006/1M input cache-hit, 1.20/1M 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 Paid.
How much does DeepSeek-V4.1-Flash cost?+
Peak/off-peak model: Off-peak (0.15/1M input cache-miss, 0.003/1M input cache-hit, 0.60/1M output); Peak (0.30/1M input cache-miss, 0.006/1M input cache-hit, 1.20/1M output). Pricing changes often - verify on the official site.
Who is DeepSeek-V4.1-Flash best for?+
Agentic coding workflows, long-context document analysis, and multimodal tasks requiring high throughput at low cost.
Who is DeepSeek-V4.1-Flash not ideal for?+
General knowledge-intensive reasoning tasks where frontier closed-source models currently lead, or environments with strict data residency requirements in non-Chinese jurisdictions.
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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