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

131K

Input price

$0.14/1M tokens

Output price

$0.42/1M tokens

Capabilities

vision

tool call

structured output

reasoning

json mode

streaming

fine tuning

batch

Details

Model IDdeepseek/deepseek-v4.1-flash

ProviderOpenRouter

CreatorDeepSeek

Familydeepseek

License—

Parameters—

Status—

Input modalitiestext, image

Output modalitiestext

Architecture—

Knowledge cutoff—

Training data cutoff—

Release date2026-09-10

Deprecation date—

Typechat

Reasoning tokens—

Max input—

Open weight—

Sourceofficial

Last updated2026-09-26

Tools

Function Callingfunction_calling

Call external functions and APIs

Pricing

Input

$0.14

↓53%$0.3

Output

$0.42

↓65%$1.2

Cache write

—

Cache read

↓33%$0.01

Batch in

—

Batch out

—

Price history · $/1M input

$0.3

$0.15

$0.3

$0.15

$0.3

$0.04

$0.14

$0.3

$0.14

Sep 11Sep 12Sep 14Sep 19Sep 21Sep 23Sep 24Sep 25Sep 26

Date	Input	Output	Cache read	Change
Sep 11, 2026	$0.3	$1.2	$0.006	—
Sep 12, 2026265df08	$0.15	$0.6	$0.003	↓50%
Sep 14, 202620b7699	$0.3	$1.2	$0.006	↑100%
Sep 19, 20263170597	$0.15	$0.6	$0.003	↓50%
Sep 21, 2026af38e5c	$0.3	$1.2	$0.006	↑100%
Sep 23, 202628ec4f5	$0.04	$0.64	$0.016	↓87%
Sep 24, 2026118451a	$0.14	$0.42	$0.004	↑250%
Sep 25, 202699b2555	$0.3	$1.2	$0.006	↑114%
Sep 26, 20269cb03f8	$0.14	$0.42	$0.004	↓53%

Input is ↓53% since Sep 11, 2026, from $0.3 to $0.14 per 1M tokens.

Price across providers

Provider	Input	Output	Since launch
Vercel AI Gatewaycheapest	$0.07	$0.3	↓53%
OpenRouter	$0.14	$0.42	↓53%
Novita AI	$0.3	$1.2	—

Family Comparison: deepseek

Model	Caps	Perf	Speed	Context	Max out	Pricing
DeepSeek: DeepSeek V4 Flash 0731 (free)	RVTS	—	—	1.0M	393K
DeepSeek: DeepSeek V4 Flash (free)	RVTS	—	—	1.0M	384K
DeepSeek: DeepSeek V4 Flash Latest	RVTS	—	—	1.3M	944K	$0.02$0.32
DeepSeek: DeepSeek V4 Flash 0731	RVTS	—	—	1.3M	944K	$0.02$0.32
DeepSeek: DeepSeek Flash Latest	RVTS	—	—	1.0M	384K	$0.04$0.29
DeepSeek: DeepSeek V4 Flash 0423	RVTS	—	—	1.0M	384K	$0.05$0.09
DeepSeek: DeepSeek V4 Flash 0731 (batch)	RVTS	—	—	1.0M	944K	$0.11$0.33
DeepSeek: DeepSeek V4 Flash Vision Exp (batch)	RVTS	—	—	1.0M	944K	$0.11$0.33
DeepSeek: DeepSeek V4.1 Flash (batch)	RVTS	—	—	1.0M	131K	$0.11$0.34
Nex AGI: DeepSeek V3.1 Nex N1	RVTS	—	—	131K	164K	$0.14$0.5
DeepSeek: DeepSeek V4.1 Flash	RVTS	—	—	1.0M	131K	$0.14$0.42
DeepSeek: DeepSeek V4 Flash Vision Exp	RVTS	—	—	1.0M	944K	$0.22$0.66
DeepSeek: DeepSeek Pro Latest	RVTS	—	—	1.0M	944K	$0.25$3.5
DeepSeek: DeepSeek V4 Pro 0813	RVTS	—	—	1.0M	384K	$0.26$0.79
DeepSeek: DeepSeek V3.2	RVTS	—	—	164K	66K	$0.27$0.4
DeepSeek: DeepSeek V3.1 Terminus	RVTS	—	—	164K	33K	$0.27$1
DeepSeek: DeepSeek V3.2 Exp	RVTS	—	—	164K	66K	$0.27$0.41
DeepSeek: DeepSeek V3.2 Speciale	RVTS	—	—	164K	164K	$0.29$0.43
DeepSeek: DeepSeek V4 Pro 0423	RVTS	—	—	1.0M	384K	$0.42$0.84
DeepSeek: DeepSeek V4 Pro 0813 (batch)	RVTS	—	—	1.0M	944K	$0.66$1.98

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 · 9 entries

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