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DeepSeek: DeepSeek V4 Flash 0731Active

deepseek/deepseek-v4-flash
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DeepSeek-V4-Flash is the efficiency-oriented variant of the DeepSeek V4 series, released as a preview and open-sourced alongside the flagship V4-Pro. It is designed for developers who need the V4 generation's long-context and reasoning capability at a faster, more economical API tier. Compared with V4-Pro, V4-Flash uses smaller total parameters and active parameters, resulting in faster response times and lower API cost. It retains reasoning capability close to V4-Pro and matches V4-Pro on simple agent tasks, with a measurable gap appearing only on the most demanding agent workflows. World knowledge is slightly below V4-Pro but remains competitive within the open-source landscape.

Like V4-Pro, V4-Flash inherits the new attention mechanism built on token-dimension compression and DeepSeek Sparse Attention (DSA), supports a 1M context window as standard, and offers both thinking and non-thinking modes with a reasoning_effort parameter (high / max).

Note on migration: the legacy model names deepseek-chat and deepseek-reasoner currently route to V4-Flash in non-thinking and thinking mode respectively, and will be retired on 2026-07-24. Existing integrations should migrate to the explicit model names deepseek-v4-flash or deepseek-v4-pro. The model is accessible via OpenAI ChatCompletions and Anthropic interfaces, with weights open-sourced on Hugging Face and ModelScope.

By:DeepSeekInput Type:Output Type:Publish time:2026-07-31

Providers

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ProviderCache Hit RateContext
Baidu
baidu
85.2%$0.22-0.44/ M tokens$0.66-1.32/ M tokensRead:0.007-0.014/ M tokensWrite:-/ M tokens1M2.82s104tps
SiliconFlow
siliconflow
-$0.22-0.44/ M tokens$0.66-1.32/ M tokensRead:0.014-0.028/ M tokensWrite:-/ M tokens1M--
TencentCloud
tencent-cloud
91.0%$0.22-0.44/ M tokens$0.66-1.32/ M tokensRead:0.007-0.014/ M tokensWrite:-/ M tokens1M1.85s114tps
Alibaba CloudSunset
alibaba
-$0.212-0.424/ M tokens$0.636-1.272/ M tokensRead:0.021-0.042/ M tokensWrite:-/ M tokens1M--
DeepSeekSunset
deepseek
-$0.22-0.44/ M tokens$0.66-1.32/ M tokensRead:0.007-0.014/ M tokensWrite:-/ M tokens1M--

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