DeepSeek: DeepSeek V4.1 Flash

Name: DeepSeek: DeepSeek V4.1 Flash
Author: 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.

Context

1.0M

Max output

944K

Input price

$0.05/1M tokens

Output price

$0.5/1M tokens

Capabilities

Show unsupported (4)

Reasoning & Interaction

Reasoning

Tool Calling

Output Control

Structured Output

JSON Mode

Details

Model IDdeepseek/deepseek-v4.1-flash

ProviderOpenRouter

CreatorDeepSeek

Familydeepseek

License—

Status—

Typechat

Input modalitiestext, image

Output modalitiestext

Open weight—

Parameters—

Architecture—

Context window1.0M tokens

Max input—

Max output944K tokens

Reasoning tokens—

Knowledge cutoff—

Release date2026-09-10

Sourceofficial

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

$0.05

Output

$0.5

Cache write

—

Cache read

$0.01

Batch in

—

Batch out

—

Family Comparison: deepseek

Model	Caps	Perf	Speed	Context	Max out	Pricing
DeepSeek: DeepSeek V4 Flash 0731 (free)	RTJJM	—	—	1.0M	393K	—
DeepSeek: DeepSeek V4 Flash (free)	RT	—	—	1.0M	384K	—
DeepSeek: DeepSeek Flash Latest	RTJJM	—	—	1.0M	944K	$0.03$1.14
DeepSeek: DeepSeek V4 Flash Latest	RTJJM	—	—	1.0M	944K	$0.04$0.15
DeepSeek: DeepSeek V4.1 Flash	RTJJM	—	—	1.0M	944K	$0.05$0.5
DeepSeek: DeepSeek V4.1 Flash (batch)	RTJJM	—	—	1.0M	384K	$0.05$0.15
DeepSeek: DeepSeek V4 Flash 0423	RTJJMSF	—	—	1.0M	944K	$0.09$0.18
DeepSeek: DeepSeek Pro Latest	RTJJM	—	—	1.0M	393K	$0.1$4
DeepSeek: DeepSeek V4 Flash 0731 (batch)	RTJJM	—	—	1.0M	944K	$0.11$0.33
DeepSeek: DeepSeek V4 Flash Vision Exp (batch)	RTJJM	—	—	1.0M	944K	$0.11$0.33
DeepSeek: DeepSeek V4 Flash 0731	RTJJM	—	—	1.0M	944K	$0.12$0.24
Nex AGI: DeepSeek V3.1 Nex N1	TJJM	—	—	131K	164K	$0.14$0.5
DeepSeek: DeepSeek V4 Flash Vision Exp	RTJJMSF	—	—	1.0M	262K	$0.22$0.65
DeepSeek: DeepSeek V3.1 Terminus	RTJJM	—	—	164K	147K	$0.27$1
DeepSeek: DeepSeek V3.2 Exp	RTJJM	—	—	164K	147K	$0.27$0.41
DeepSeek: DeepSeek V3.2	RTJJM	—	—	164K	66K	$0.28$0.42
DeepSeek: DeepSeek V3.2 Speciale	RJJM	—	—	164K	164K	$0.29$0.43
DeepSeek: DeepSeek V4.1 Flash 1017	RTJJM	—	—	1.0M	393K	$0.3$1.2
DeepSeek: DeepSeek V4 Pro 0813 (batch)	RTJJM	—	—	1.0M	944K	$0.66$1.98
DeepSeek: DeepSeek V4 Pro 0423	RTJJMSF	—	—	1.0M	384K	$0.82$1.63
DeepSeek: DeepSeek V4 Pro 0813	RTJJM	—	—	1.0M	393K	$1.32$3.96

API

GET/v1/models/openrouter/deepseek/deepseek-v4.1-flash

DeepSeek: DeepSeek V4.1 Flash

deepseek/deepseek-v4.1-flash

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.

Changes · 32 entries

deepseek/deepseek-v4.1-flashcreateca7a400Nov 2, 2026, 03:02 AM

deepseek/deepseek-v4.1-flashupdateb2f45bfOct 29, 2026, 03:29 AM

pricinginput$0.3→$0.045output$1.2→$0.5

deepseek/deepseek-v4.1-flashupdatef054294Oct 22, 2026, 06:37 AM

pricinginput$0.049→$0.3output$0.375→$1.2cached input$0.001→$0.006

deepseek/deepseek-v4.1-flashupdate4e8b6afOct 21, 2026, 06:35 AM

pricinginput$0.035→$0.049output$0.011→$0.375cached input$0.002→$0.001

deepseek/deepseek-v4.1-flashupdate42a9895Oct 20, 2026, 06:39 AM

pricinginput$0.046→$0.035output$0.08→$0.011

deepseek/deepseek-v4.1-flashupdate49ce653Oct 19, 2026, 06:45 AM

pricinginput$0.065→$0.046output$0.144→$0.08

deepseek/deepseek-v4.1-flashupdate63ba2aaOct 18, 2026, 06:34 AM

max_output_tokens393216→943718

pricinginput$0.15→$0.065output$0.6→$0.144cached input$0.003→$0.002

deepseek/deepseek-v4.1-flashupdate03ad82bOct 17, 2026, 06:33 AM

max_output_tokens943718→393216

pricinginput$0.036→$0.15output$0.684→$0.6cached input$0.005→$0.003

deepseek/deepseek-v4.1-flashupdatebcf2693Oct 16, 2026, 06:36 AM

pricinginput$0.014→$0.036output$0.891→$0.684

deepseek/deepseek-v4.1-flashupdateb92059eOct 15, 2026, 06:37 AM

pricinginput$0.005→$0.014

deepseek/deepseek-v4.1-flashupdate0d5a9a1Oct 14, 2026, 06:38 AM

pricinginput$0.044→$0.005

deepseek/deepseek-v4.1-flashupdate29d19afOct 13, 2026, 06:43 AM

pricinginput$0.3→$0.044output$1.2→$0.891cached input$0.006→$0.005

deepseek/deepseek-v4.1-flashupdateda0e420Oct 8, 2026, 06:41 AM

pricinginput$0.05→$0.3cached input$0.02→$0.006

deepseek/deepseek-v4.1-flashupdateb61df6aOct 7, 2026, 06:39 AM

pricinginput$0.003→$0.05output$2.4→$1.2cached input$0.003→$0.02

deepseek/deepseek-v4.1-flashupdate00710a0Oct 6, 2026, 06:38 AM

pricinginput$0.3→$0.003output$1.2→$2.4cached input$0.006→$0.003

deepseek/deepseek-v4.1-flashupdate632cde3Oct 5, 2026, 06:54 AM

pricinginput$0.003→$0.3output$2.4→$1.2cached input$0.003→$0.006

deepseek/deepseek-v4.1-flashupdate8c3d4a3Oct 4, 2026, 08:18 AM

pricinginput$0.3→$0.003output$1.2→$2.4cached input$0.006→$0.003

deepseek/deepseek-v4.1-flashupdate02333c9Oct 3, 2026, 06:38 AM

pricinginput$0.015→$0.3output$0.75→$1.2cached input$0.015→$0.006

deepseek/deepseek-v4.1-flashupdate2b89bf1Oct 2, 2026, 06:39 AM

pricinginput$0.027→$0.015output$0.6→$0.75cached input$0.027→$0.015

deepseek/deepseek-v4.1-flashupdate8c801e2Oct 1, 2026, 06:40 AM

pricinginput$0.3→$0.027output$1.2→$0.6cached input$0.006→$0.027

deepseek/deepseek-v4.1-flashupdate1a66bb0Sep 29, 2026, 06:40 AM

pricinginput$0.03→$0.3output$0.6→$1.2cached input$0.029→$0.006

deepseek/deepseek-v4.1-flashupdatef41f4c4Sep 28, 2026, 06:53 AM

max_output_tokens384000→943718

pricinginput$0.035→$0.03output$0.29→$0.6cached input$0.001→$0.029

deepseek/deepseek-v4.1-flashupdate6ba56d7Sep 27, 2026, 06:43 AM

max_output_tokens131072→384000

pricinginput$0.14→$0.035output$0.42→$0.29cached input$0.004→$0.001

deepseek/deepseek-v4.1-flashupdate9cb03f8Sep 26, 2026, 06:38 AM

max_output_tokens393216→131072

pricinginput$0.3→$0.14output$1.2→$0.42cached input$0.006→$0.004

deepseek/deepseek-v4.1-flashupdate99b2555Sep 25, 2026, 06:38 AM

max_output_tokens131072→393216

pricinginput$0.14→$0.3output$0.42→$1.2cached input$0.004→$0.006

deepseek/deepseek-v4.1-flashupdate118451aSep 24, 2026, 07:08 AM

max_output_tokens943718→131072

pricinginput$0.04→$0.14output$0.64→$0.42cached input$0.016→$0.004

deepseek/deepseek-v4.1-flashupdate28ec4f5Sep 23, 2026, 06:40 AM

max_output_tokens384000→943718

pricinginput$0.3→$0.04output$1.2→$0.64cached input$0.006→$0.016

deepseek/deepseek-v4.1-flashupdateaf38e5cSep 21, 2026, 06:49 AM

pricinginput$0.15→$0.3output$0.6→$1.2cached input$0.003→$0.006

deepseek/deepseek-v4.1-flashupdate3170597Sep 19, 2026, 06:34 AM

pricinginput$0.3→$0.15output$1.2→$0.6cached input$0.006→$0.003

deepseek/deepseek-v4.1-flashupdate20b7699Sep 14, 2026, 06:48 AM

pricinginput$0.15→$0.3output$0.6→$1.2cached input$0.003→$0.006

deepseek/deepseek-v4.1-flashupdate265df08Sep 12, 2026, 06:33 AM

pricinginput$0.3→$0.15output$1.2→$0.6cached input$0.006→$0.003

deepseek/deepseek-v4.1-flashcreate17bcfbfSep 11, 2026, 06:36 AM