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DeepSeek Just Released V4.1-Flash-1017, Scores 77.0 on DeepSWE, Opens Search API

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Deepseek releases V4.1-Flash-1017 open-weight model with improved performance

Deepseek released V4.1-Flash-1017 as an open-weight model, claiming better benchmarks and faster task completion than its predecessor while reducing costs. The company also opened its search API.

Oct 17, 2026·2 sourcesDeepSeekAI tools & productsOpen-source AIAI research & benchmarksAI foundation modelsOpen weights vs closed models
Deepseek releases V4.1-Flash-1017 open-weight model with improved performance
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The Decoder

Deepseek V4.1 Flash 1017 beats larger rivals in agentic tasks while once again massively cutting per-task costs