DeepSeek V4.1 Flash vs Mistral Medium 3.5

Same documents, same prompt: where each model is right, what it really costs and how fast it answers.

At a glance

Task · documents	English (US)	Czech	German	Spanish	French
Invoice extraction	99.4% / 97.8%	99.9% / 93.5%	99.5% / 97.4%	98.3% / 97.0%	99.4% / 98.2%
Email triage	97.6% / 94.9%	97.4% / 94.5%	96.3% / 92.7%	—	—
Personal data detection	99.6% / 99.7%	99.7% / 99.8%	99.8% / 100.0%	—	—
Contract clauses	100.0% / 98.1%	100.0% / 100.0%	97.2% / 97.1%	—	—

Correct fields: DeepSeek V4.1 Flash / Mistral Medium 3.5; the better one in bold. Click a cell to see the details.

Invoice extraction · English (US) (150 documents)

DeepSeek V4.1 Flash is more accurate by 1.6 pp. DeepSeek V4.1 Flash is 8.4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.4%	97.8%
Error-free documents	93%	79%
Per 1,000 documents	$0.52	$4.37
To fix / 1,000	67	207
Speed (median)	5.7 sec	2.3 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Supplier	100.0%	100.0%
Supplier ID (EIN, IČO…)	100.0%	100.0%
Invoice number	100.0%	100.0%
Payment reference	96.7%	94.7%
Invoice date	100.0%	98.7%
Due date	100.0%	99.3%
Net by tax rate	100.0%	88.0%
Tax by rate	100.0%	98.7%
Total	100.0%	100.0%
Currency	99.3%	100.0%
Bank account	97.3%	96.0%

Documents where they differ

Gomez & Sons, LLC · 7855 · Scan · DeepSeek V4.1 Flash 11/11, Mistral Medium 3.5 9/11
Reid Office Products LLC · A-003849 · Scan · DeepSeek V4.1 Flash 10/11, Mistral Medium 3.5 11/11
Miranda-Vega Group LLC · 4959 · PDF text · DeepSeek V4.1 Flash 11/11, Mistral Medium 3.5 10/11
Raleigh Engineering Inc. · INV253511 · Scan · DeepSeek V4.1 Flash 11/11, Mistral Medium 3.5 10/11
Archer-Smith Group LLC · A-004846 · Scan · DeepSeek V4.1 Flash 11/11, Mistral Medium 3.5 10/11
Austin Landscaping Inc. · INV-17836 · Scan · DeepSeek V4.1 Flash 10/11, Mistral Medium 3.5 11/11
Jon Miller · INV250236 · Clean image · DeepSeek V4.1 Flash 11/11, Mistral Medium 3.5 10/11

Invoice extraction · Czech (150 documents)

DeepSeek V4.1 Flash is more accurate by 6.4 pp. DeepSeek V4.1 Flash is 9.4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.9%	93.5%
Error-free documents	99%	63%
Per 1,000 documents	$0.50	$4.69
To fix / 1,000	13	367
Speed (median)	5.0 sec	2.6 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Supplier	99.3%	90.0%
Supplier ID (EIN, IČO…)	100.0%	87.3%
VAT ID	100.0%	85.3%
Invoice number	100.0%	99.3%
Payment reference	100.0%	95.3%
Invoice date	100.0%	88.7%
Tax point	100.0%	86.7%
Due date	100.0%	90.7%
Net by tax rate	100.0%	99.3%
Tax by rate	100.0%	98.7%
Total	100.0%	100.0%
Currency	100.0%	100.0%
Bank account	99.3%	94.0%

Documents where they differ

Pavlík a Zeman s.r.o. · 25500457 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 9/13
Hrubý s.r.o. · DB2500960 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 9/13
Jiřina Švecová · 25401227 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Stejskal, v.o.s. · FV2600175 · Photo · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Slavěna Pospíšilová · 26200409 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Stavsklad s.r.o. · 2025/1111 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Sedláček s.r.o. · 2025/0774 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Dvořák a Matějka spol. s r.o. · FV2501205 · Photo · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13

Invoice extraction · German (150 documents)

DeepSeek V4.1 Flash is more accurate by 2.2 pp. DeepSeek V4.1 Flash is 8.3× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.5%	97.4%
Error-free documents	94%	75%
Per 1,000 documents	$0.57	$4.72
To fix / 1,000	60	253
Speed (median)	6.4 sec	2.5 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Supplier	99.3%	97.3%
Supplier ID (EIN, IČO…)	98.7%	98.7%
VAT ID	99.3%	96.0%
Invoice number	100.0%	100.0%
Payment reference	100.0%	92.7%
Invoice date	100.0%	98.0%
Tax point	99.3%	90.7%
Due date	99.3%	97.3%
Net by tax rate	100.0%	98.0%
Tax by rate	100.0%	100.0%
Total	100.0%	100.0%
Currency	100.0%	100.0%
Bank account	98.0%	97.3%

Documents where they differ

Meier GmbH · 2025-0264 · Photo · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Bauunternehmung Schröder GmbH · 2026-0622 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 10/13
Druckerei Baumann GmbH · 2025-0324 · Scan · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 13/13
Ostmetall GmbH · AN-2025-00580 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Hoffmann UG (haftungsbeschränkt) · 2025/1479 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Dachdeckerei Fischer GmbH · 2025/0014 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Malerbetrieb Otfried Haas · RE-2025-00168 · Scan · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 11/13
Christoph Haas – Hausmeisterservice · 2025-1432 · Clean image · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 11/13

Invoice extraction · Spanish (79 documents)

DeepSeek V4.1 Flash is more accurate by 1.3 pp. DeepSeek V4.1 Flash is 6.7× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	98.3%	97.0%
Error-free documents	77%	67%
Per 1,000 documents	$0.71	$4.75
To fix / 1,000	228	330
Speed (median)	5.8 sec	2.5 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Supplier	93.7%	99.0%
Supplier ID (EIN, IČO…)	100.0%	100.0%
VAT ID	100.0%	94.0%
Invoice number	100.0%	100.0%
Payment reference	97.5%	93.0%
Invoice date	100.0%	100.0%
Tax point	98.7%	93.0%
Due date	100.0%	97.0%
Net by tax rate	88.6%	85.0%
Tax by rate	100.0%	100.0%
Total	100.0%	100.0%
Currency	100.0%	100.0%
Bank account	98.7%	100.0%

Documents where they differ

Talleres Rozas Zapata S.L. · FV25-01486 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Academia Checa S.L. · F2025-0208 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Goñi Logística S.L. · R-2025/1460 · Scan · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 13/13
Onofre Diez Guitart · R-2025/1100 · Clean image · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 13/13

Invoice extraction · French (74 documents)

DeepSeek V4.1 Flash is more accurate by 1.2 pp. DeepSeek V4.1 Flash is 7.4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.4%	98.2%
Error-free documents	92%	81%
Per 1,000 documents	$0.65	$4.81
To fix / 1,000	81	190
Speed (median)	5.7 sec	2.6 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Supplier	100.0%	99.0%
Supplier ID (EIN, IČO…)	100.0%	99.0%
VAT ID	98.7%	98.0%
Invoice number	100.0%	100.0%
Payment reference	98.7%	94.0%
Invoice date	100.0%	100.0%
Tax point	100.0%	100.0%
Due date	100.0%	100.0%
Net by tax rate	100.0%	95.0%
Tax by rate	100.0%	98.0%
Total	100.0%	99.0%
Currency	100.0%	96.0%
Bank account	94.6%	98.0%

Documents where they differ

Établissements Blanc SAS · F-11122 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 11/13
Constance Martin – Rédactrice (EI) · FAC25080663 · Scan · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Guérin & Fils EURL · 2026-05-688 · Clean image · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13

Email triage · English (US) (150 documents)

DeepSeek V4.1 Flash is more accurate by 2.7 pp. DeepSeek V4.1 Flash is 6.3× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	97.6%	94.9%
Error-free documents	79%	57%
Per 1,000 documents	$0.23	$1.47
To fix / 1,000	213	427
Speed (median)	3.8 sec	0.8 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Category	100.0%	100.0%
Priority	96.7%	63.3%
Sentiment	82.0%	90.7%
Customer name	100.0%	100.0%
Order number	100.0%	100.0%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	100.0%

Documents where they differ

Cody Baldwin · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 7/9
Danielle Little · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 7/9
Kyle Schwartz · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
James Arnold · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Gene Everett · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Laurie Knight · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Dale Sanchez · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
David Patel · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9

Email triage · Czech (150 documents)

DeepSeek V4.1 Flash is more accurate by 2.9 pp. DeepSeek V4.1 Flash is 6.6× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	97.4%	94.5%
Error-free documents	77%	55%
Per 1,000 documents	$0.30	$1.95
To fix / 1,000	227	447
Speed (median)	4.2 sec	0.8 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Category	100.0%	100.0%
Priority	98.7%	63.3%
Sentiment	78.0%	87.3%
Customer name	100.0%	100.0%
Order number	100.0%	100.0%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	100.0%

Documents where they differ

Milan Kašpar · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Eduard Stejskal · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Alois Sedlák · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Lucie Kašparová · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Alexandr Kubíček · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Ignác Bartoš · Email · DeepSeek V4.1 Flash 8/9, Mistral Medium 3.5 9/9
Lýdie Tůmová · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Zuzana Brožová · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9

Email triage · German (145 documents)

DeepSeek V4.1 Flash is more accurate by 3.6 pp. DeepSeek V4.1 Flash is 5.8× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	96.3%	92.7%
Error-free documents	68%	48%
Per 1,000 documents	$0.30	$1.77
To fix / 1,000	324	520
Speed (median)	4.2 sec	0.8 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Category	100.0%	100.0%
Priority	97.2%	56.7%
Sentiment	69.7%	78.0%
Customer name	100.0%	100.0%
Order number	100.0%	100.0%
Invoice number	100.0%	100.0%
Amount	100.0%	100.0%
Currency	100.0%	100.0%
Deadline	100.0%	100.0%

Documents where they differ

Augusta Lange · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 7/9
Rolf-Peter Metz · Email · DeepSeek V4.1 Flash 8/9, Mistral Medium 3.5 7/9
Friedbert Hoffmann · Email · DeepSeek V4.1 Flash 8/9, Mistral Medium 3.5 9/9
Swantje Noack · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Rosemarie Steuer · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Raymund Weiß · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9
Sylwia Gerlach · Email · DeepSeek V4.1 Flash 8/9, Mistral Medium 3.5 9/9
Pamela Mosemann · Email · DeepSeek V4.1 Flash 9/9, Mistral Medium 3.5 8/9

Personal data detection · English (US) (150 documents)

Mistral Medium 3.5 is more accurate by 0.1 pp. DeepSeek V4.1 Flash is 4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.6%	99.7%
Error-free documents	97%	98%
Per 1,000 documents	$0.29	$1.15
To fix / 1,000	27	20
Speed (median)	3.8 sec	0.8 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Names	98.7%	99.3%
Email addresses	100.0%	100.0%
Phone numbers	100.0%	100.0%
Addresses	98.7%	98.7%
Dates of birth	100.0%	100.0%
National IDs	100.0%	100.0%
Bank accounts	100.0%	100.0%

Documents where they differ

Both models got the same number of fields right on every example document.

Personal data detection · Czech (150 documents)

Mistral Medium 3.5 is more accurate by 0.1 pp. DeepSeek V4.1 Flash is 4.4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.7%	99.8%
Error-free documents	98%	99%
Per 1,000 documents	$0.31	$1.40
To fix / 1,000	20	13
Speed (median)	4.2 sec	0.8 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Names	100.0%	98.7%
Email addresses	100.0%	100.0%
Phone numbers	100.0%	100.0%
Addresses	98.0%	100.0%
Dates of birth	100.0%	100.0%
National IDs	100.0%	100.0%
Bank accounts	100.0%	100.0%

Documents where they differ

Zikmund Sedláček · Text · DeepSeek V4.1 Flash 7/7, Mistral Medium 3.5 6/7

Personal data detection · German (148 documents)

Mistral Medium 3.5 is more accurate by 0.2 pp. DeepSeek V4.1 Flash is 4.5× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	99.8%	100.0%
Error-free documents	99%	100%
Per 1,000 documents	$0.31	$1.38
To fix / 1,000	13	0
Speed (median)	3.7 sec	0.9 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Names	100.0%	100.0%
Email addresses	100.0%	100.0%
Phone numbers	100.0%	100.0%
Addresses	98.7%	100.0%
Dates of birth	100.0%	100.0%
National IDs	100.0%	100.0%
Bank accounts	100.0%	100.0%

Documents where they differ

Gunnar Zorbach · Text · DeepSeek V4.1 Flash 6/7, Mistral Medium 3.5 7/7

Contract clauses · English (US) (150 documents)

DeepSeek V4.1 Flash is more accurate by 1.9 pp. DeepSeek V4.1 Flash is 7.3× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	100.0%	98.1%
Error-free documents	100%	87%
Per 1,000 documents	$0.32	$2.35
To fix / 1,000	0	127
Speed (median)	3.9 sec	1.1 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Provider	100.0%	87.3%
Provider ID	100.0%	100.0%
Client	100.0%	88.7%
Client ID	100.0%	99.3%
Contract type	100.0%	100.0%
Price (net)	100.0%	100.0%
Currency	100.0%	100.0%
Billing period	100.0%	100.0%
Effective date	100.0%	100.0%
End date	100.0%	100.0%
Notice period (months)	100.0%	100.0%
Late-payment penalty (% per day)	100.0%	100.0%
Governing law	100.0%	100.0%

Documents where they differ

Page Printing LLC · Raleigh Printing Inc. · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 11/13
Frontier Solutions Inc. · San Diego Office Products Co. · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 11/13
Boston Supply LLC · Summit Systems Corp. · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 11/13
Blue Ridge Services Co. · Foster Janitorial Services Corp. · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13

Contract clauses · Czech (150 documents)

Both are equally accurate. DeepSeek V4.1 Flash is 7.3× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	100.0%	100.0%
Error-free documents	100%	100%
Per 1,000 documents	$0.42	$3.06
To fix / 1,000	0	0
Speed (median)	4.3 sec	1.2 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Provider	100.0%	100.0%
Provider ID	100.0%	100.0%
Client	100.0%	100.0%
Client ID	100.0%	100.0%
Contract type	100.0%	100.0%
Price (net)	100.0%	100.0%
Currency	100.0%	100.0%
Billing period	100.0%	100.0%
Effective date	100.0%	100.0%
End date	100.0%	100.0%
Notice period (months)	100.0%	100.0%
Late-payment penalty (% per day)	100.0%	100.0%
Governing law	100.0%	100.0%

Documents where they differ

Both models got the same number of fields right on every example document.

Contract clauses · German (145 documents)

DeepSeek V4.1 Flash is more accurate by 0.1 pp. DeepSeek V4.1 Flash is 5.4× cheaper.

Metric	DeepSeek V4.1 Flash	Mistral Medium 3.5
Correct fields	97.2%	97.1%
Error-free documents	77%	75%
Per 1,000 documents	$0.51	$2.76
To fix / 1,000	228	247
Speed (median)	4.6 sec	1.2 sec
Valid answers	100.0%	100.0%

Accuracy per field

Field	DeepSeek V4.1 Flash	Mistral Medium 3.5
Provider	100.0%	100.0%
Provider ID	81.4%	82.0%
Client	100.0%	100.0%
Client ID	82.8%	80.7%
Contract type	100.0%	100.0%
Price (net)	100.0%	100.0%
Currency	100.0%	100.0%
Billing period	100.0%	100.0%
Effective date	100.0%	100.0%
End date	100.0%	100.0%
Notice period (months)	100.0%	100.0%
Late-payment penalty (% per day)	100.0%	100.0%
Governing law	100.0%	100.0%

Documents where they differ

Haustechnik Braun UG (haftungsbeschränkt) · Nordbau GmbH · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 11/13
Maintec GmbH · Schreinerei Wagner GmbH · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Neumann Consulting UG (haftungsbeschränkt) · Huber AG · Contract text · DeepSeek V4.1 Flash 13/13, Mistral Medium 3.5 12/13
Walter Systemtechnik GmbH & Co. KG · Weiß Handel GmbH · Contract text · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 13/13
Fuchs GmbH · Hartmann & Brandt UG (haftungsbeschränkt) · Contract text · DeepSeek V4.1 Flash 12/13, Mistral Medium 3.5 13/13