DeepSeek

DeepSeek: DeepSeek V4.1 Flash

deepseek/deepseek-v4.1-flash

canonical: deepseek/deepseek-v4.1-flash-20260910

Descriptionfrom OpenRouter

DeepSeek V4.1 Flash is a sparse mixture-of-experts model from DeepSeek, and the first built on the company's Causal Encoder-Decoder (CED) architecture. It activates 8B parameters on input and 16B on...

Context length

1,048,576 tok

Max completion

943,718 tok

Knowledge cutoff

—

Expires

—

Added to OpenRouter

9/10/2026

Cache last refreshed

11/12/2026

Primary modality

text+image->text

Source

OpenRouter

Input modalities

textimage

Output modalities

text

Pricing

Field	Per token (USD)	Per million
prompt	0.0000003	$0.300
completion	0.0000012	$1.20
input_cache_read	0.000000006	$0.006

Supported parameters(22)

frequency_penaltyinclude_reasoninglogit_biaslogprobsmax_tokensmin_pparallel_tool_callspresence_penaltyreasoningreasoning_effortrepetition_penaltyresponse_formatseedstopstructured_outputstemperaturetool_choicetoolstop_atop_ktop_logprobstop_p

OpenRouter page Hugging Face

Videos

16:45

DeepSeek V4.1 Flash Is Shockingly Good for the Price

Sep 10, 2026 · YouTube

38:58

Testing Particle-1: a post-trained DeepSeek V4.1 Flash specializing in coding and efficiency

Oct 28, 2026 · YouTube

Rounds

21 answersin this database. A round opens every model's answer to the same prompt.

Sep 23, 2026Creative WritingThree Takes: The Flooded Libraryanswer
Sep 10, 2026Vision & PerceptionThe scroll testin a video round answer
Sep 10, 2026Vision & PerceptionCar Identificationin a video round answer
Sep 10, 2026KnowledgeName 100 Womenin a video round answer
Sep 10, 2026Speed & AccuracyBeach drone action registerin a video round answer
Sep 10, 2026Speed & AccuracyVendor booth lead cleanupin a video round answer
Sep 10, 2026Speed & AccuracyHomeowner help center batchin a video round answer
Sep 10, 2026Speed & AccuracyTrade show support repliesin a video round answer
Sep 10, 2026MedicineThe Worried Patient Replyin a video round answer
Sep 10, 2026MedicineIt's Never Lupusin a video round answer
Sep 10, 2026Psychology & Business AcumenThe Labubu PR nightmarein a video round answer
Sep 10, 2026Psychology & Business AcumenThe email you don't want to sendin a video round answer
Sep 10, 2026CodingThe Atomic Banditin a video round answer
Sep 10, 2026CodingThe same soldierin a video round answer
Sep 10, 2026CodingLast one standingin a video round answer
Sep 10, 2026CodingPage two, againin a video round answer
Sep 10, 2026CodingShip it in 1998in a video round answer
Sep 10, 2026CodingDrop the slinkyin a video round answer
Sep 10, 2026CodingThe Cybertruck rallyin a video round answer
Sep 10, 2026CodingA hundred thousand of themin a video round answer
Sep 10, 2026CodingTwo kilobytesin a video round answer